Bests & Worsts Reviews from Amazon

This box is pre-wired with receptacles and breakers. It has a 50-Amp breaker on the 50-Amp RV 240/120v 4-wire socket. There is a 30-Amp breaker on the 30-Amp RV 120v 3-wire socket. There is a 20-Amp breaker on the 20-Amp duplex GFCI receptacle. The weatherproof lid covers the entire front and there is enough room with it closed for the cables to exit the bottom between the door and panel front. More breaker slots are available for additional circuits, but there's probably only room for one more major socket to be added -- and you must be able to cut any hole required for that. Feed power into top, back, bottom, or sides. I have added a photo of the TL137US as received.