I connected our camera to a running light. Headlights on camera on lights off camera off. Power is already at the rear of trailer for this easy to connect. Works for us as I always tow with my headlights on.
Lippert sells a Goosebox. I use a Colibert adapter with no problems. Check the link below it is from Lippert the frame manufacturer so there should be no problems using it.
Another good thing about a vented tailgate is that my stuff now stays in the bed of the truck when towing the fifth wheel. I have lost rubber wheel chocks, wood and other things. Now every thing stays in the truck bed.
I have used RV Cooling Unit Warehouse. Dave was great to work with. Frig cooled great with new unit. Warranty on parts was easy and fast to replace. We had a new frig heater go out after a few months and new was shipped with out question. Instructions were clear and easy to follow in installing new cooling unit.
Our RV frig and freezer does the same when we open it on a hot day. We have learned to just wait a little or pull harder on the doors if we need to get back in it quickly. I think its a good thing I know the seals are good and working.
Someone might have a remote.Go to a mall parking lot around the holidays and see how many cars you can unlock with your car remote. It will surprise you how many, and yes the wife gets on to me for doing that.
I would check the weight rating on the wheels. A lot of aftermarket wheels do not have a weight rating large enough to tow a trailer or put anything in the bed. I think you will be surprised how low a lot of the aftermarket wheel ratings are.