I have a trifold….not sure what brand. I like it. The only drawback I have found is that you can’t put something in the bed that is the same size as the bed. If, as you say, you only transport groceries, the trifold should be fine.
We have a subscription carwash. It has the floppy cloth brushes. Not crazy about the carwash. I have found small scratches on the side of the Gladiator. I haven’t changed out the OEM antenna so it beats the crap out of it. We live in a rural area, so our radio signal isn’t very good!