Truck is the smarter way to move it, unfortunately. Every SFRush I've moved, (Way over 10x by now) I've used a wide ramp I made to roll it up and into the bed. 3/4" 4x8 plywood sheet would work, but I would additionally attach some 2x4s or 2x4s under it to give it more strength. These things are not light at all.
You may or may not be familiar with the games, but assuming their rollers work, if they're on flat ground they are effortless to move in XY directions. It's the Z direction that is the killer.
I would also ABSOLUTELY anchor the top of the ramp to the tailgate somehow. (I use tiedown straps combined with mechanical ways of holding them, like little C clamps or hooks) If that ramp slides, you have just created a super dangerous physics situation.
Let me see if I can find some pics on my phone. They're on it somewhere, they're just not organized at all. And I have no idea what month/year I've moved a bunch of these at once. But I know that I've taken pics a few times, just to show easier ways of pulling it off.