Combs wrote:
Finding a used 3500 dually with gas engine is next to impossible. Also concerned with the lower torque, horsepower and durability of a gas engine.
They aren't as common but plenty of gas trucks around.
For a truck camper (even a monster one), they have plenty of torque and HP. A truck camper doesn't take a monster engine. Depending on brand, you may even be able to get more HP in the gas version (example 2010 Ford: gas V10 = 365hp vs diesel = 350hp).
Durability is ancient history from back when 100k miles was a lot to get out of a gas engine and diesels were simple slow turning low HP 2 ton blocks of iron. Modern gas engines typically outlive the truck and modern diesels have plenty of electronics and ancillary devices that make them no more reliable.