You don't say what size battery they gave you on this unit but if it is a group 24 like most do, You might consider upgrading to something with more staying power. Since you say you plan on boondocking 90% of the time, My advice is to read some of the threads you find by searching that forum section along with searching solar.
Building a decent size battery bank with a couple 6v golf cart batteries or large group 31 or 34 12v deep cycle batteries would significantly increase your power storage. Adding a couple hundred watts of solar power to keep them recharged would be a very good solution for making sure your a "happy camper".
Congrats on the new unit!