I'm also in the market for a 5Th wheel this spring. Last fall went out and bought a new PU to haul it.
I looked real hard at diesel vs. gas and did a lot of research on both plus talked to a number of my shooting buddies that had diesels. I ended up buying a Chevy Extended Cab 2500HD with 6L gas, 6 speed tranny.
1. I live where it gets cold and didn't want to have to plug in the truck every night
2. I'll use the truck 75% for travel and 25% for towing
3. I get 14 in town and 18 on the highway, just a 1 or 2 mpg short of my buddies diesels.
4. Gas is almost 50cents cheaper than diesel, makes up for the difference in mpg.
5. Maintenace is half what the diesel costs, oil changes and repairs.
6. The $8000 difference in price from gas vs diesel will buy a lot of gas.
7. Availability of fuel when traveling in remote places.
Three of my friend that own diesels now say if they buy new it will be gas.
Those are the reasons I bought what I did, I'm sure you diesel owners have your own reasons and I guess that's why they offer both.

Last edited by jbmi; 01/18/10.

"The older I get, the better I was"