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I think I’d see a benefit with a fiberglass cap because it would extend the cab height out to the rear bumper. My Expedition doesn’t lose nearly as much efficiency as my truck does. It’s just about justifying the cost and hassle against everything else I do with the truck.
I pulled my boat to the St. Croix river this afternoon with my boys. 115 miles round-trip and I returned with 21%. Extra efficiency with the boat would be nice, but it’s essentially worthless because I have no problems with range beginning and ending at home.
I've run thru a few trucks with and without caps over the years. Love hate relationship. Loved the added protection for cargo, both utility and extended living space. When I was still rearing the younguns such as you are now, loved the cap for getting those two argument antagonizers out of the cab with mom and I. Brother/sister 3 years apart. Took the back glass out of both the topper and truck and put in an accordion boot to seal the two spaces for climate control and in a few cases referee duty.
Hated the blind spots it creates.
It's literally a try it and see if you like it kind of deal, completely subjective. Sorry to add to your list of things to consider lol.
Today, 08:36 PM
Brother/sister 3 years apart. Took the back glass out of both the topper and truck and put in an accordion boot to seal the two spaces for climate control and in a few cases referee duty.