My dealer sold me the D-rings at cost, when I bought the trailer. I used up a bag of 50, but I have a ring in any spot I desire. LOL

My 12V deep cycle battery doubles as my flight box battery. It's mounted in a cart, and has quick disconnects that go to the trailer's wiring. By doing this, I can run the trailer's interior lighting without being connected to the tow vehicle. Like a camper, mine i wired so the battery can be charged by the tow vehicle during transport.

Also like a camper, I can run an extension cord from a 110 source, and plug into the trailer to provide household current to outlets inside the trailer.

I recently added an awning to provide shade on those hot Summer days, also from a camper.

My neighbor used to own an RV repair facility. He aked what I'd like to have in my trailer, and offered suggestions. I bought the stuff, and he did the installations............. for free !!!