Jeff-
If you go to
www.remcotowing.com and then to their "application charts", you can look up any make and model to see whether it can be towed flat without modification, towed flat with the addition of a lube pump or driveshaft disconnect, or not flat-towable at all.
Usually, a front wheel drive vehicle with a manual transmission will be towable, as will a manual or automatic 4WD (not AWD) vehicle with a transfer case that can be shifted to neutral (such as Jeep products, 4WD trucks and SUVs, etc.). There are, however, many exceptions to that general rule. Automatic 2WD vehicles are more of a mixed bag, some towable, some not, some towable with transmission lube pumps.