I don't understand the fear of not having FHUs. All RVs can carry water. All RVs have batterys & can be selfsufficient for a number of days, depending on tankage, available battery power & the capability to recharge.
FHUs are nice to run the A/C in extreme heat or electric heaters in the cold. Other than in those conditions all should be able to survive at least a couple of days without FHUs.
Not requiring FHUs makes traveling without reservations much easier. The FHUs always go first. W&E go next. That leaves power only or dry which are the last to be taken.
