Lots of old cars and trucks with problems that were fixed in later years so it makes no sense to bash a particular brand based on experiences with these vehicles.
Diesel costs more and is more difficult to find (along with DEF) when traveling off the interstates. The trucks cost more to buy and more to maintain. These costs are offset when towing a heavy load of 10,000 lbs. or more but for a truck hauling a 3000-5000 lb. camper load it is overkill.
I owned a full size SUV and it had its place but at 16 MPG I did not use it for commuting or to go shopping. I used the SUV to go skiing or scuba diving or take the dogs to the beach or pickup plants at the nursery where it was the better choice over the two cars I own.
If someone is asking whether to get a gas or diesel powered pickup for towing a trailer my advice would be based on the weight of the trailer when fully loaded. If someone is buying a pickup for a camper the choice is a no brainer with gas coming out ahead by any logical criteria chosen.
There are emotional reasons for buying a diesel pickup as there are for having a Hummer or having a truck lifted and putting on 35 inch tires and that is OK as it a person's right to be illogical if it is their money they are spending. But trying to make it sound like the smart thing to do is a waste of time and not being entirely honest, both with oneself and with others.