Gotta Think About The Movies
It's been a long time since I've seen any of the B2TF movies, but....
I seem to remember a scene in the one that had a Wild West theme where they tried to pull the DeLorean with a team of horses to get it up to 88MPH.
Later in the movie, of course they used a steam locomotive to push it.
Maybe the way to go, to keep in synch witht he movie, is to either pull the car with a team of horses (simulated of course), or push the car with a steam locomotive (simulated of course). If you're gonna use your SUV, somehow if you could make it look like a steam locomotive, that would let you push the car AND maintain the theme of the movie.
First, how do you get your Toyota to look like a steam loco? Do they have a vehicle wrap for that?
If you can solve that, then anyone with some passable welding skills could make up a detachable towbar/pushbar out of common steel square tubing stock to connect the cars. It would not have to be too strong or sophisticated since you're pushing and only at walking speeds.
Or, you could combine a Tony Natoli signature-model:devil: Harbor Freight towbar and a trailer hitch on the X. Of course instead of the X pulling the SUV, the SUV will be pushing the X.
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=94696
I know at one time UHaul had trailer hitches to fit the X because I had them install one on my first X in 1982.
And once the cars are connected, you can further take advantage of that by using the Toyota to provide the electrical power you need for your special effects, that way you don't even have to run the X at all, avoiding the wear-and-tear issues.