If you're looking at 04 to 07 GM and Dodge/Ram trucks, both gas and diesel, I have good news for you. You really can't make a bad choice. Any of those 4 (Dodge gas & diesel and GM gas & diesel) would serve you well.
I would base my decision on the actual truck you look at. No matter the brand, overall condition is key.
The diesels will:
- cost more up front (truck for truck)
- get better mpg loaded and empty
- perform better when loaded/hauling
- be more expensive to fix if they breakdown
- retain their value better (as you will see when you shop)
The gas engine trucks will:
- perform adequately when loaded with your ~7500# RV
- work better in Sask winters (heat up faster)
- will get worse mpg when empty or loaded
- be cheaper to repair if they breakdown
- be cheaper to buy
Up to you to decide what out of that list is important to you and shop accordingly. Around Western Canada, the HD trucks with gas engines are generally a bargain because most people want the diesel. Supply and demand.
