I am very satisfied with my solar panel mounts. I have driven to California and back and all around Nevada and Utah this summer. The only issue I noted was that one night with a strong cross wind, the roof made some popping sounds. This doesn't happen driving down the road at 75 mph. It seems like only a strong cross wind causes the noise. Others have noted this issue, expecially with the Grandby, with the longer roof. I don't think it is a problem, just a very minor annoyance under certain weather conditions.
I would not change the screw fastening into the tubing or the tubing size. I did notice that Home Depot or Loews does sell a 3/4 inch square tubing, which might also work well. The small tubing supports in the middle of the panel is just to provide a little support and to prevent sagging. I did NOT put screws in the middle of the panel, just used VHB to attach the center square support to the roof, and sikaflex to attach to the panel. If I have to remove, ii should be easy enough to lift up and remove the center support with a knife. So far that center support is still very solid.
As noted, I did add two more panels to my roof. In the picture below, the new panels are the shorter ones. They might look wider, but all four panels are exactly the same width.
In these 2 new panels, I used a slightly different method to stiffen the sides of the panel. Instead of a 1 inch by 1/16 inch flat bar, I used a angle piece of 1/2 inch per side, by 1/20 inch, with one side sticking up.
I had to use small 1/2 inch flat pieces to build out the bottom to make for solid platform for attaching to square tubing.
Finally, here is a detail of the screw in the center front mount.
The weight of the flexible panels alone is about 4 pounds. The total weight of the mounting, including all tubings, bars, screws, VHB tape, etc, is 1 1/2 pounds, so the total weight of the panel with all mounting is 5 1/2 pounds. I have no problem lifting the roof of my Grandby myself (age 71) with the extra 22 pounds. (I do have the exterior lifter things.)
Edited by Zirdu, 03 December 2017 - 01:47 AM.