We have owned 3 DP's since 1993. A Gulfstream, A Monaco, and an Allegro Bus. All three motorhomes were used primarily for snow birding each winter for 3-5 months. We used all 3 on a limited basis other than the winter trips. I always serviced our coaches BEFORE I put them into our storage building, plugged them in, and kept careful attention to the water level in our batteries during "long" periods of storing. As an alternative to plugging the coach into electricity, there are cutoff switches for both the house and the chassis battery. I choose not to start the coach now and then as it sat as I agree, if you're going to start it up, take it for a 30 min drive--which by the way, is a really good idea on a monthly basis.
We NEVER had any problems with our drive train or chassis so I don't believe DP's are any different than any other vehicle. Go for a DP, it's a terrific way to travel and live in for extended or short periods of time!