We were lucky to purchase Tim's (TM Rep) old demo model and found out that it had the 40 gal potable water tank.
I tell you this because we found that our tote wouldn't hold all the potable water we carried. It necessitates dumping twice. Be sure of your potable water tank size as this may sway your decision for which size tote to purchase, especially if you want to dump as few times as possible per stay.