I looked at several. A few of the PU boxes came close to the dimensions I was looking at, about 11”x11”x60” and a few probably would fit. Finally bought material to make one, that way I can ensure it fits in the available space without moving the propane tanks or hitch brackets. It a project I’ll get to later this summer.
2016 Ford F350 Lariat CCSB, 6.2, 4.3, 4WD
2021 Jayco 33 RBTS
2019 Forest River Wildwood 26 DBUD: Gone
2012 Jayco 32 BHDS: Long Gone
2007 R-Vision 25: Long Long Gone
1965 Frolic Cabover: My First RV