I have the bakflip, OEM spray in liner, and OEM extender and it is no issue at all. I use it to make a smaller section in the bed for small hauling jobs.

 

If you could get an extra section to the Ford extender, it could form a square edged U and hold more stuff.

 

Ive had both. I had an amp reacher one before on my old truck. I have the OEM one on my 2017 f150. Both have their pros and cons. Amp research pros: easily removable, light weight, doubles as a seat at a campground if you take it out and put it upside-down. cons- solid metal so if you need your whole bed for larger items you have to take it out. Ford OEM. Pros; foldable- folds nicely out of the way when you don't need it. Solid build quality . cons. expensive. Makes it harder to reach the bed light switch. Makes the box link system useless (closest to the tailgate) other than for tie down cleats

 

My son found me a set of the OEM's on FB Market and picked them up for $25. and it works great. I have a tri fold cover and it is a little harder to get the releases pulled down but it still works.

 

Those with bed extenders, any trick to turn on the lights? The positioning of the extender in the bed is right at the switch location. Poorly designed IMO.