So we were somehow able to locate a roadshower4 (they are on backorder everywhere at the moment) and I had 2 days to get it mounted on my prinsu rack alongside my giant 4-person RTT.
I Love the creativity of the OP, and actually sent this trhead to prinsu design studios and told them to give you a few grand and buy your CAD design
@MRG_TRG.
I also wanted to mount ehs hower side-to-side (not front-to-back). With only 2 days to mount and no machining/welding setup at home, I took a simpler approach, steps and photos below:
1. Buy a 4" X 4" X 8' L-bar of aluminum (from home depot)
2. Spray paint it black (crinkle paint, of course) so it matches color - important for the instagram bragging
3. Cut it off to be the width of the road shower - about 4".
4. Drill holes in aluminum to fit carriage bolt into roadshower, attach.
5. Put drill bit through side of prinsu rack and drill through L-bracket (so height lines up). Bolt-washer-washer-nut through side of prinsu.
In other words, just using L-brackets of aluminum I was able to rest the shower on the prinsu rack and secure it in place. Not hanging off the side.
I'm happy to say it was a huge success on the 10-day trip from oregon dunes to Tahoe, CA.
Total cost was less than $100. Uploading photos to this forum is dumb so here's a link to google photos album:
prinsu shower - Google Photos