I tow with a Van and nothing for the RV goes in the Van.
WD bars go on a mount on my Trailer Tray that I made with Square Bolts.
Drivers side has two bins, one for water hose, the other for chocks and 20 lynx levelers. I pull both bins out usually when setting up and leave them under the trailer. Also on the drivers side is a milk crate with the CATV cable, end for the sewer hose, sewer donut, dogbone power adapters, gloves and big wrench, all stuff used for setup. On top of that stuff sits the big mohumbo 50amp power cord.
Passenger side has twoards the front of the rv-fishing rod storage holder to hold scissor jack handle, bug lantern pole, tounge jack handle, and garbage bag holder (fits on picnic bench). To the rear of the rv two small bins with general maintenance items (for the generator, grease, small straps and bungies), and a tool bag. Between the front and rear and back about 12" is the patio mat, and some camp games (washers, croquet), and in front of that is the grill.
Camp chairs found a new home in the outside kitchen.