I have taken several stabs at making a ground based vehicle that will be fun to drive and have descent range. I tried 75Mhz for control and only made it one block! I tried using a Futaba 9Z with DragonLink too. Range was fine, but I hated driving with a flight TX. Not at all fun for me and it made my rock crawler lurch back and forth when trying to use F/R on the right ELE stick.
I think the perfect combo would be to find a traditional 75mhz TX with the wheel and throttle trigger and ideally a third channel toggle switch to pan a 180 servo left and right, and interface it with my DragonLink. Ground TX's don't have trainer ports usually, so could there be a way to tap the PPM signal from a ground wheel TX?