Then there are cars that have onerous limitations on them. I think its some model of Honda that limits you to 60 mph and every 3 hrs you have to stop, and start the TOAD up and run it for 5 minutes and cycle the transmission thru all the selector positions, then put it back in neutral (or however it is set up).
Many people will tell you all manual shifts are flat towable, which is not true. In a manual shift being towed, the rear main shaft is spinning and nothing else is, so there is no lube being thrown up by the cluster gear to keep the rear mainshaft bearing lubricated. Some vehicles get enough splash from bumps and shaking and others, like the little BMW Z3 two seat sports car, have the fluid level so far below the mainshaft that they cannot be flat towed.
Others, such as some late model JEEP products with electric boosted steering, may require a special wiring harness from the dealer to power the steering during tow to prevent damage to the steering system.
When I had the motor home I looked into a TOAD but it meant more insurance, maintenance, etc and for my limited traveling, I could not justify it. I finally found that a motorhome, even the small class C I had, simply didn't fit my traveling and camping style. I sold it and bought a pickup truck and travel trailer. Everyone has different styles of camping and traveling and there are configurations of RV's that suit them best.
Charles