Stop in for a cup of coffee
Typically I leave the engine on the wheeled cart and leave it at the tailgate. Truck rides best there, but you have the trailer to help. Then I use long ratchet strap from 1 corner of the front of the bed hook, around engine to the other front hook. Then a 2nd ratchet strap from 1 back corner hook, around engine, to the other back corner hook. Then straps are pulling against each other. Hauled a 460/C6 from FL to WI on wheels. Never budged.