Have noticed at most of shows , most engines stay on trailer. We block up trailer before engine is run, lots of work. Have seen many differant ways to ease this effort.this is what we have come up with, even my wife can set up to show.
We cut four 2 buy 4 inch channel and welded them on each corner of trailer.At about 35 degree angle.Found square channel that would slide into welded pieces on trailer . drilled several holes,in your sliding channel to ease set up so you can pin in differant holes.. we bought electric tongue jack and mounted it .use any good hardwood. to support your legs.let the frt of trailer down as far as you can. lift trailer till rear legs are at disstance you want lower frt legs and lower your jack takes 5 minutes to do with little effort. you can do same thing with hand jack.maybe not your wife and unless she is a strong one.
cost of electric 3000lbs about 300.00.but the ease of set up is worth every penny . engine will no rock at all and is very safe hope this helps. be safe out there .