So, I took a look at getting Rommel's Road to work in SP.
I managed to get three of the spawns working (I don't know what happened to the fourth, but I guess I must have done something wrong)

For now, I just exported the spawns from the original SP map and used DCED and a hex editor to import them, that way the coords would be almost correct (and it wouldn't immediately drop me through the ground or something)

I'll try again with the Definitions Stern attached.
For the most part, the mission seems to be working. I renamed mpscripts.dat to scripts.dat, and it most of the enemies are working, except for the two tanks at the start. One just sits there (I don't know if he is supposed to) behind the spawn, and the other sits in the valley in front of the vehicles. The really odd part is the two enemy soldiers who hover in midair above the second tank. I am guessing the scripts for them aren't working properly, so I will take a look there later on.
Other than that, the mission is working fine. All of the vehicles are driving around properly, enemies are acting as they are supposed to, so I guess it is just a few scripts that aren't working.