A wall framing kit is the structural skeleton a conversion hangs from. Instead of screwing furring strips into the van ribs and hoping, you glue in a precision-fit plywood frame that fits around the factory metal structure and get a flat, square, load-rated mounting plane on both walls.

What that buys you: a solid base to bolt cabinets to, and upper bunks that are genuinely rated. L-track inserts drop into the frame to give you continuous adjustable tie-down points the length of the wall.

These are built by Noke Van Co in Roanoke, Virginia for the 2019-current Sprinter in 144" and 170" wheelbases. Install after insulation and before panelling. Extra fasteners are in 80/20 Hardware.