We have decided to buy a TT as we spend quite a bit on hotels, but we've also figured it would be a good way to reduce our costs for awhile so as to focus on paying down debt and saving $$$ for a home...
If you truly wish to power the roof air from solar move to a 48 volt battery consisting of 300 to 400 amp-hours of LI battery bank, mated to a 48 volt inverter/charger and add 2000 watts of solar panels to the roof.
Or moderate your desires and install about 600 watts of panels with a 500 amp-hour 12 volt battery bank with a 3000 watt inverter/charger to eliminate generator use except for running the roof air conditioner.