Ours was very unstable / wobbly. To secure the 5/8" panel, which in my case is just maple plywood, I used a kreg jig for pocket holes for the screws. At the bottom there are 4 screws on one side, 3 on the other, so a stagger pattern from one side to the other. Same thing at the top. Then the pocket screw holes are covered by poplar trim on each side. Prior to the main panel, on the outboard wall, I did a filler panel to take up some of the space where it looked the same on both sides. No doubt it is rock solid.
John and Rebecca Dickson
Emma-8 / Little John-5 / Iva-1+
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)