Thanks for that. Since they don’t have factory hookups then you need to build them. I haven't done it, but I have re-plumbed my existing hookups and I'm convinced it isn't a very difficult task. You need a drain and then hot and cold water lines.
Hot and cold water which is easy- just tap into the lines running to the bathroom sink. Cut it, install a "T" with Sharkbite fittings, and then run water to where you need it.
Then you need a 1 1/2” drain. Drop down into the area below the bathroom, add a p-trap. Now you need to decide if you’re going to share the existing sewer outlet or if you’ll add a new one. Reusing the existing one means cutting off what’s there so that you can run a pipe into it. Adding a new one means you need to step up to a standard 3” sewer connection.
As well, you need a vent. There are standard vent kits. It's cutting that 4" hole that makes people get panicky.
The worst part may be that you need a 20amp outlet to plug into. Running the Romex/electric from the electric panel may be difficult depending on where it is and how accessible the storage areas underneath are.
It sounds like a lot of work but it’s really not terrible. I replumbed my combo washer/dryer in our fifth wheel/toy hauler garage because it was going to a black tank. I added a diverter valve so I can either dump it straight to the sewer or to the existing black tank.