I ended up with an RB components storage box that I wont be able to use with my build out. Here is a link:
Box is 3-sided. 76" long 13.5" high and 22" deep. It is meant to go around the wheel well and create a storage space and platform for an RB components sofa or bench. It's in like new shape and breaks down flat for shipping.
Let me know if anyone is interested.
Retails for $545.99