[Texas Steve]

For Electrical Management System, I use Progressive. Mine is 50 amp hardwired into the trailer, but they have portable in either 30 amp or 50 amp depending on what you have.

For water pressure regulator I think it is a Watts (just like pictured above).

And for wheel chocks, I did just like George and got the heavy rubber ones from Harbor Freight. I added a loop of rope to the eye bolt to make pulling them easier.

Good luck with your camping experience and stay safe!