> They just aren't wealthy enough to dedicate the truck to that single purpose so it is also used as a "daily driver".
They might be better served by doing the math, and realizing that they are far better off buying an economical vehicle at a much lower price point and for much lower maintenance and fuel costs, and then renting a heavy duty vehicle to tow their boat the few times a year they actually need to.
The trouble with that idea is that it is very difficult to rent a heavy duty vehicle for towing. Most rentals explicitly disallow towing or other types of heavy usage.
They might be better served by doing the math, and realizing that they are far better off buying an economical vehicle at a much lower price point and for much lower maintenance and fuel costs, and then renting a heavy duty vehicle to tow their boat the few times a year they actually need to.
One should optimize for the most common use case.