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Trucks, Trailers and Hauling for Shows

New Project Trailer/RV


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  #1  
Old 11-26-2010, 04:08:29 AM
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ListerDiesel ListerDiesel is offline
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Default New Project Trailer/RV

We are just starting on a new combined trailer/RV for next season, rated at 3.5tons max weight it will carry our Ruston 1ZHR diesel and also give us a comfortable living area to use while we are away at shows.

Ordered the steel yesterday, should be delivered this morning, about 1/2 a ton of box sections.

The basic body is going to be built by a local truck body shop after we have built the chassis, ali extrusion, honeycomb walls and fibreglass roof.

Drawing below, that's as far as we have got with the design up to last week, I'll post some more copies when we have finished sorting out the mountings for the body.

Peter

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Old 11-26-2010, 05:54:42 PM
John C Walker John C Walker is offline
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Default Re: New Project

Is this a drawbar wagon type of unit if so I want to see someone back it into a parking spot, could be a problem, can be done but my what an exercise. Otherwise looks like a good way to combine a place to stay and a place to show. Best of luck with it.
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Old 11-27-2010, 03:11:21 AM
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Default Re: New Project

Hi John:

Yes, it is a drawbar, but reversing in a tight spot is usually done with a towball on the front bumper, which makes life a LOT easier!

We are just working on the body side mountings, side and top raves etc. All available as stock items, and a honeycomb side panel 17mm thick which is very stiff but light in weight.

Weight is just under a ton, estimated. The legal maximum for a trailer this size is 3.5 tons, the axles are rated at 1.3 tons each.

Peter
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Old 11-27-2010, 12:48:01 PM
K D Redd K D Redd is offline
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Default Re: New Project Trailer/RV

ListerDiesel,

Are there any what we call "Gooseneck Trailers" used in England? If not,is there motor vehicle laws that do not allow this type of trailer or is there are not large enough pick-up type trucks to tow them. "Gooseneck Trailers" are VERY popular here where I live. You see them in all configurations. Cattle/ Horse, flat bed equipment movers, Box trailer and Big Round Hay Baler movers. DAD and I built a flat bed for moving a pulling tractor years ago using 3X5 5/16" wall tubing. We were going to use 2X6 1/4" wall tubing but we got a deal on the 3X5 that was cheaper than the 2X6. We used three Mobile Home Axles which had brakes on all three axles. We found that we could replace the electric brake backing plates with mid 60's Ford 3/4 and one ton from axle backing plates to convert to hydraulic brakes.

Kent
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Old 11-27-2010, 07:39:26 PM
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Default Re: New Project Trailer/RV

Hi Kent:

We don't have that class of trailer at all, mainly as we don't have the pickups to haul them

Once you go past 3.5 Tons trailer weight, you have to have power brakes, and only trucks have that option, usually air operated. We don't have electric brakes either, which is a bit of a pain, and as nobody has managed to get them Type Approved for use in the EEC, we cannot buy US-built braking units either.

So, 3.5 Tons is the maximum trailer weight with over-run braking, and there are very few vehicles, including commercials that will haul that weight. We have a Land Rover Discovery V8 that is rated at 3.5 tons, but most light commercials are only 2 tons max. You need to go to a light truck to get more.

Peter
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Old 11-27-2010, 09:12:59 PM
K D Redd K D Redd is offline
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Default Re: New Project Trailer/RV

Some of the goose necks use a Vacuum over Hydraulic system here. When we built the trailer I spoke of a did the brake convertion, What we did for the master cylinder was to mount the power brake master cylinder from a 50 series Chevy truck in the back of the cab of the truck I pulled the trailer with. The trailer brakes were activated by a handed that we mounted next to the gear shift in the floor board of the truck. Worked it with your right hand. When the trailer loaded, there was no need to uses the truck brakes. We used a hydraulic coupler at the ball hitch point to couple the hydraulic line with a bleeder in the top of the neck to bleed the air out that was introduced when coupling was made.

Kent
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Old 11-28-2010, 05:12:24 AM
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Default Re: New Project Trailer/RV

Sounds ingenious!

We did a smaller over-run hydraulic braking system in the 1970's on a small camping trailer/tent that we built.

There is a market for a better system over here, something that gives proportional braking with a fail-safe feature. The issue is providing the motive power for the brakes.

Peter
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Old 01-14-2011, 02:02:15 PM
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Default Re: New Project Trailer/RV

Bit of an update:

We have cut the first metal, some 10" X 4" heavy box that will carry the front axle swivel bearings etc. That is down at the machine shop being drilled and milled for the bearings and supports.

21mm honeycomb flooring panelks were picked up during a service call to a customer this week, they are 11' by 7' and will cover all of the flooring and the central divide between the engine section and the living area. Might have enough to do the two rear doors as well.



It is all GRP material, very light but very stiff.

LPG supplies for cooking and the fridge are taken care of by a refillable 29 litre (7.5 US gallons) LPG cylinder. This is refillable at gas stations that sell LPG as well as petrol, and the LPG is much cheaper than buying exchangeable cylinders.



A small Chinese genny came last week, cheap as chips but for what we want it will do fine, 2.75kVA 240V.

Current trailer drawing below:



Extra-heavy duty checker plate for putting over the flooring arrived this afternoon, cut to size and posted by an ebay vendor:



More to follow.

Peter
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Old 01-18-2011, 06:40:42 PM
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Default Re: New Project Trailer/RV

Bits are starting to come in from being machined, we had the main pivot bearing box sections back from the shop today:






One of the bearings loosely assembled on one side of the main box.



Both radial thrust bearings loosely assembled in place.



The bolts are 3/4" UNF, the inner diameter of the face bearings is 75mm, the box section wall is just over 3/8" thick.

Because of distortion in the box section main faces, we had to take it to a machine shop with big presses to get the sides flattened before we could get them machines.

Peter
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Old 03-03-2011, 03:33:39 PM
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Default Re: New Project Trailer/RV

Been a lot going on, but been busy with work and other 'non-playtime' things, but we are very close to welding up the chassis frame now, we are spending two days down at our metalbashers place next week to get it all together and bring it back home.

The chassis is 21ft long and with three axles, front one way out in front as a steering axle.

The main engineering bits are all done, pictures here of the main pivot assembly:



Top bearing with pivot shaft poking through:



Top safety cap which prevents the shaft from pulling out if the bearing fails:



All the parts on the floor, less one blue radial thrust bearing:



The main pivot shaft is 75mm diameter or just under 3", the should is 100mm or just under 4". The black cap head screw is 30mm or just over 1-1/8" diameter, 7/8" hex Allen Key size.

I'll take more pictures as we weld up the chassis etc and post them.

Peter
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