We have full timed in our Infinity, Sooner or later you will "boondock camp" for an extended time. The size/capacities of your fresh/black/gray tanks & propane tank will dictate how long you can stay "off the grid" and how many showers you have available.
Also keep in mind that the coach really needs to have as much "outside" storage areas as You can get..You will accumulate more "stuff" as time goes on. and it is a trade off question as to "Do I want to have slides or do I want more outside storage".
We chose to have storage vs slides. (for things such as a small chest freezer, folding picknik table & benches,fishing poles/w tackle box, large tool box,extra hoses for sewer/water/& power. outside elevated fire pit, BBQ grill and the list goes on and on
An SOB called Foretravel