I worked in a military spec industry a while ago and became used to certain fastening methods since, if for no other reason that if they didn't fall off of fighter aircraft they probably wouldn't fall off of my vehicles.
I was pleasantly surprised when I received the Promaster159 Stealth+ rack and read through the instructions, realizing that at least one engineer who designed the Stealth+ rack had a GMP if not mil spec background. Makes quite a difference for tolerances all around.
Putting the rack together was easier than expected, and as long as you didn't tighten everything fully as you went along, waiting to torque everything at the end, the final fit expertly contoured to the roof of the Promaster.
The versatility of this rack is quite understated, and if you peruse the 80/20 applications website you will see for yourself. I have been using 80/20 extrusions in my work life for decades, for scientific instrument frames, and at home for kayak and bike racks and trailers. Stealth+ would apply to any industrial application such as TV/Radio remotes, not just RVs.
I am going at my roof rack in stages, trying to combine racing kayak (21' carbon kevlar) mounts with the ability to have a partial deck, and possibly a solar panel. My wife is almost over the initial shock of such an investment for a roof rack when so many other parts of the van project need to be addressed, but she also sees how versatile the use of roof space becomes, andBill has already been able to make her own comparisons to some of our friends with other racks which she has describe as "flimsy looking". Yeah, the Stealth+ does present well and exudes "robust"!