FWIW here is my solution on a Winnebago EVC. Notes:
?- I didn't want to drill holes on the part of the roof that keeps one dry :)
?- Custom made SS roof gutter simulators on the sides 30 cm long - I should have made them twice that long
??? - U can buy them but they are usually steel, too short, and too expensive for what they are
?- mounted towards the back to keep the weight as far back as possible
?- inside the roof side is a flat SS plate, so that each SS mount sandwiches the plastic roof
?- I added rear hinge gas struts on the inside of the roof to handle the extra weight on the back of the roof
Also the Thule Hullavator has gas assist struts, which make getting it back up on roof pretty easy - I don't believe the Yakima equivalent solution has them.
As well, I added bent aluminum rods with clamps to the rack uprights (inside and out) so that I can tie down paddle boards - (they really should have been part of the rack if they were thinking when they designed it). Ugly but functional. I didn't want to drill the rack uprights so the rod would right in-between the two legs of the upright - maybe someday... tho I'm afraid to weaken them.
?
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George Y
95 EVC Winnabago - Ottawa ON area
