StoreYourBoard Single Kayak Ceiling Rack, Adjustable Storage Mount, Overhead Garage System

Can you have more then 150lbs loaded if you use 3 poles on each side I have two tandem kayaks that weight 74lbs each dry so these won't work with 2?

Can I extend lower?

Does anyone have experience using this on 10' ceilings? How difficult is it to get the kayaks up when the rack is that high? Thank you!

Given the upward angle of the arms, will a 16 inch deep kayak fit with the arms as low as they can be adjusted away from the ceiling?