Help me chose a tonneau cover

You may want to consider a rolling tonneau cover. I find them more versatile to carry large cargo without having to remove them. They are also great for a fifth wheel if you ever go that route in the future.

I had a Roll N Lock on my last truck which was OK and have a Retrax on my current truck which I would recommend without reservation. It looks great, works great, and offers decent protection from weather and theft. It is great for locking up pricey items at night in campgrounds too.