I have installed a Yakima overhead rack system mounted on the raingutters. Since top is fiberglass, and so are the gutters, will this limit the load I can carry (like a spare tire)? Would i be better with a rail system?
Sure will.
Odds are if you put a wheel up there it will eventually fatigue the fiberglass and break off. That's why they have rail systems. THe Yakima rack is good for camping gear (tents, coolers, etc)
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