We have found that in using the unlimited hot water tank, it's best to "turn the switch on, set the hot water temp to your comfort on the hot water side only, and use just the hot water side in a shower". Otherwise you may end up scoulding yourself.
Don't forget a water line pressure control unit to keep the pressure under forty pounds just in case the campground pressure is too high. A simple electric testing unit, to make sure the electric service is correct. Carry some leveling blocks (small plastic blocks are light) to help level the stabilizers. I purchased a 50 amp to 30 amp dog bone just in case the need ever came up. Extra drinking water hose (you never know). A back-water preventer to deal with the black water tank spray unit.
Simple things that will keep you out of trouble. Congratulations on your purchase.
From Cajun Country
Jayco 2016 Grey Hawk 29MV Champagne
Toad - '16 Subaru Forester (Pearl White - manual transmission)
Blue Ox (everything) for the TOAD
EEZRV TPMS System