The answer to this question will depend on what part of the country you might be from and will you be able to put it into indoor storage, cover with a tarp, or will it sit out in the open.
Our 2002 Trail-Lite does not have any parasitic electric draw so it will sit from the end of October to the middle of May and the engine battery has not discharged. For that reason, I see no need to exercise the engine and drive train. We are lucky enough to have indoor unheated storage.
The generator is a slightly different case. I worry that the little bit of gasoline in the carburetor will evaporate and leave a residue inside that will plug the jets. So,....I try to visit the RV every 4 to 6 weeks and start the generator and let it run for about an hour while I pop some popcorn and possibly the A/C while watching TV.
It might help if you would share what storage you anticipate, what part of the country, and do you have parasitic draw on the chassis battery.
2002 Trail-Lite Model 211-S w/5.7 Chevy (click View Profile)
Gene