Congratulations on your new unit, enjoy.
Biggest lessons I learned:
1 Weigh it. Put all the beer, beans and bedding on and weigh it. You'll be surprised. Sounds like you have enough truck, but the CCC on a well equipped unit is a lot less thank you think. I use a little flow gauge (under $10 on Amazon) to put a known quantity in the water tank. 100 gallons of water is 800 pounds. Tow with holding tanks as empty as possible.
2 The tires...... you know what to do. Get a TPMS.
3 Keeping the water out. On a lot of wall penetrations the ONLY thing keeping the water out (and thus the rot) is a little bead of caulking along the edges of the hatches etc. Watch it like a hawk. If there's any decay, remove hatch and reinstall with proper waterproofing. Check the roof, regularly. (Factory says every 90 days)
4 Run your generator, regularly, under load. At least once a month.
4 Check the seals on the wall where the slides meet the wall. They are rubbers in a track and can come out. (mine have). The top one is the only thing keeping water off the top of the box, which is inside when in storage. Resist the temptation to put any kind of treatment on them that makes them ever so slightly sticky. Most products do.
5 ALWAYS put stabilizer in the gas tank.
6 Know how to winterize it in the summer. That way it's a lot faster and easier when the weather gets nasty!
All I can think of for now......