I have a BAK Flip (not roll-up) on my truck and it's held up well since 2009 except for when it got hailed on. It now looks like someone took a ball peen hammer to it but it is still functional and sheds rain & snow. I understand the new ones are more resistant to hail.
BTW, once it's folded, it will support over 200 pounds (I sometimes sit on it). 
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2010 3150RL
LevelUp, Dual 6 volt batteries, Progressive Industries EMS HW50C, Honda EU2000i Generator, Bridgestone Duravis R250 tires, Torklift Glowstep Revolution Stairs, LED Tail lights
2015 RAM 3500 Laramie SRW LB CC Cummins 6.7L Aisin Trans B&W RVK3600
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