If the galvanized unistrut doesn't rust, why would you have rust stains on the RV? I definitely don't want that eithe
I used some of those in between panels https://www.amazon.com/gp/product/B07YGYMPLB/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 You will need to use the right screw head for those or use a stainless washer on top if you prefer hex head. I ordered some socket head bolts in 1/4" stainless, those ended up being slightly small on head size, ended up using some stainless 1/4" bolts bought at a big box lumber yard with phillips button head. I also used Eternabond double sided tape where each lag bolt hole went thru the roof followed by Dicor on the side of the Unistrut where the tape is to keep dirt from sticking to the Eternabond and covered Unistrut roof lag bolt heads with Dicor. I expect no leaks, Eternabond double sided is not fun to work with. If you have TPO roof, be sure to use the primer, I tape off the spot as I don't want the overspray outside the tape mounting area.How is everybody attaching the solar panels to the unistrut? I like the idea of THESE with spring nuts.
I will be mounting most, if not all, of my panels on my RV parallel to the unistrut, and i think I will just laser cut 12ga stainless steel brackets that bolt to the unistrut and to the panel. But on the metal building next to me, I will be mounting all the panels perpendicular to the unistrut, and using those Clamps linked above would be perfect.
Several choices on the ends, I ended up just fabbing a bracket from aluminum angle but that required drilling thru the side of the panel frame. I didn't really have a choice, space constraints. These would work or something similar. https://www.amazon.com/UI-AI-Solar-...T2KPV8X6T4Y&psc=1&refRID=BPGWQTCWKT2KPV8X6T4Y
Now, if you want some tilting panels, well, that's a different story. I have one panel on each side of the roof air and as one would be most likely shaded during the day. I fabbed my own mechanism for the electric actuator that slides a pin automatically in the retracted position to lock the panels down for travel. Killed many hours doing it. Had to fab my own hinges and mounts too, good thing I have a TIG welder. If you want to buy something, Kevin Means either is making and installing these or sold the design to someone and they make them. https://www.rvforum.net/threads/tilting-solar-panels.96179/ And the product is Solar Vector. https://www.solarvector.net/ those are not cheap however and how they mount them on an RV is a joke using expanding nuts.
But the best design I've seen for tilting in both directions for max output was on FB by Gene Morris in the Solar Powered RV group. Has to be heavy though. Had 2400w of panels, " Total solar output went from 25% on a perfect day to 65% on a warmer, high haze, sunny day!"