I will try to save you some time here. I am looking at this strictly based on a fiscal perspective...so don't get mad at me....the numbers do not lie!!!
As with most snowmobile riders, I am a contractor and go thru Pick-up Trucks like most of you go through girlfriends (a lot)!!! As a landscape contractor we haul 10,000lb trailers daily. And I have tried all makes of Pick-up Trucks....gas and diesel.
Here is what I know:
Diesel trucks I have owned : 05 duramax, 03 7.3 F350, 02 3500 dodge cummins, and an 06 6.0 F350
-- First of all, you had to even ask the question "Gas or Diesel"?
-- Diesels are a pain in the ***. They can haul the piss out of whatever is behind them, which is nice, don't get me wrong.
-- Diesel fuel seems to cost more now (don't know why, but it does). So to recover the cost of a diesel option you would need to drive your truck approx 200,000 miles to pay for the difference in diesel versus 87 octane (based on a Diesel engine at a $4,000.00 option, diesel at $3.00/gal and regular unleaded at $2.75/gal. That does not include $100 oil changes or diesel 911 at $9 to treat 50 gallons of diesel. (resale is better for a diesel right now, but that seems to be changing in our neck of the woods).
-- Trust me on this....a diesel out of warranty is going to cost you!!!! Sell it at 100k miles.
-- Diesels are great for work trucks, not for your personal vehicle. You step in diesel fuel at a pump, you might as well throw your shoes in the bed of the truck.
-- Every diesel I have owned, pulling a enclosed snowmobile trailer cross country average 10 to 14 mpg at 75 mph. (diesel dudes lie all day about fuel mileage or they drive 55 mph)
-- My current 2007 - 6.0 GMC 3/4ton gasser, pulling the same enclosed snowmobile trailer, gets 9 to 11 mpg at 75 mph.
-- A diesel dude will say he gets better mileage than above. He may get 16 or 17 mpg after he spends another $3k on a programmer, exhaust, and intake.
-- All of the additions are great, but there goes your 100k warranty.
-- I loved the pulling power of all of the diesels I owned for my personal pick-ups, but if you are only pulling a enclosed sled trailer go with the gas. You will save a ton of money and a ton of worries.
You may not have to drive all the time either, because the diesel dudes always seem to want to drive!!!!