I havent yet..what Iam working on is my brother is getting me some thin alluminum plate from his job, cut to the inside bottom and sidewall, for support...I will bolt it and use large fender washers on the composite bed side, so the bolts dont pull through the bed..
The bed extender will still work, you have to leave it out when not needed..
This is the 16" tall box..they make 20", but it would be to tall for a bed cover, which I also have yet to install...Man I have been lazy latley...:lol: