Originally Posted by KsFolly
I'd suggest a piece of 3/4 ply 4x8 sheet.
Install your eyebolts to that with large washers.
Put a non slip mat (maybe that black mesh tool drawer liner stuff) down in the truck. Then put the ply down. Then ride the bike in and anchor to the eyebolts.
It shouldn't be able to tip over at that point. Center stand with a tie down to the front wheel so it can't come off.
Compress suspension with ratcheting tiedowns.
Brace the ply to the corners of the truck or to any available wall clamp points.
I was thinking to look around and find some heavy oak pallets, like at a place the makes things out of rolled or square stock steel. Then knock out a center board, to make a space for a wheel and then eyebolts into the main beams of the pallet for the straps. One for each wheel. But the plywood is the same idea (big wide base to stap down to) and easier to find.