This is part of the old plumbing, thought the hose going into the wall was from a water tank, but no, it just went into the wall and over to the outside water fill opening. The wires on the floor were probably to the water tank and water pump which have been removed some time ago.
Also it appears a previous owner was a member of an ultra-Reich Wing group. The Birch John Society!! Someone replaced the old travel trailer toilet with a regular toilet and put it in where the shower used to be. It is set up like the toilets on trains used to be way back when. There's no holding tank for it and unless I hook up some drain pipe it'll dump right out on the ground. I plan to tie it in to the septic system where we used to have a mobile home. We're not going to use the trailer for travel, just want to have a "guest cabin" when the kids come to visit.
The pieces parts are worth more than I paid for everything, boat, trailer, and motor. Got it all for $450, so don't think I went wrong in buying it. Once it is made seaworthy it should be worth several times what I paid.