Yes they can hold a lot of weight. Mine is a Bakflip MX4 and the max weight capacity is 400 lbs evenly distributed. The panels are aluminum not fiberglass.
@Draketak I would be happy to. Here is the make and model:
https://www.amazon.com/dp/B0FHHX6QBJ?ref_=pe_123509780_1038749300_t_fed_asin_title
The brand is Yacuta. I will also note that with my setup, I can lower the tailgate with the boat attached.
Here is my system. I regularly go highway speeds up here in North Idaho.
My rack is an Amazon copy of the Yakima system. I use heavy duty straps, 2 attached to the rack and the other 2 attached to my bed hooks through the stake hole pockets. I also attach to more to the hooks on my BakFlip...
My wife and I sold our place in Seattle and our place in Bellingham last year. We moved to a home we built in Dover Bay Idaho. It has been the best move ever. I flyfished over 100 days last year. We are fortunate because we live on the water. We are also cross country skiers and the trail is...