Just because you can do laundry does not mean you have to do it. But if you wanted or needed to use it, it is there. They also offer other options for this Host Mammoth instead of the washer you can get a second smaller sofa or full cabinets in that slide.
These HOST Mammoth campers require a very heavy duty truck. 1-ton dual rear wheels minimum. I inquired about these from Host and they have some people using 350/3500 some on 450/4500 and others on 550/5500. Depending on the options you have on the camper and on the cargo carrying weight of the vehicle. The base weight of these are 3955 and this one has quite a few heavy items added.
I’m pretty sure most of these mammoths are at the max of what most 350/3500 are capable of for max payload empty. Also if you’re talking short bed mega cab pickups they’re out of the question. I wouldn’t spend the amount these things cost just to squeak by on max payload of my pickup.