None. Fearing the unknown issues with roof mounted solar panels (mounting holes and cable routing), I'll instead rig a "when needed" pole mounting system.
Interior
None...
Customizations
Just minor amenities/conveniences; added second battery with a marine on/off master switch; purchased 2-bank solar system and 3500 Watt Inverter for the boon-docking trips we want to try. We're also learning the issues associated with water usage and gray-water retention and bought a caddy to better manage dumping needs.
Renovations and Repairs
Kitchen faucet failed - dealer replacement was botched and I had to re-do myself (lesson learned: ALWAYS check work done by repair facility before putting back into storage. Qualify check/verification seems non-existent.)
Tow Vehicle
2002 GMC Sierra SLT (5.3L Gas) with E2 WD hitch.
Favorite Camping Destinations
We haven't had a bad trip - they've all been great experiences in the state of WA. We've done about a dozen weekend trips since we arrived, and are still learning. We're looking forward to nation-wide trips.