The diesel is great for pulling for sure. However, you need to ask yourself how you will drive it most of the time. 1) Are you just running errands in town only driving a few miles each way?
2) Are you going to let it sit up and drive a "daily" driver and use it sparingly?
3) How big of hills are you really going to be pulling?
The gas truck if you answered yes questions 1&2, and if you only have moderate hills like in most of Alabama, Ms, Ga, Fl, Louisiana.
I would not consider a 1500 for the load you are speaking of hauling.
The 250/2500, 350/3500, 450 are going to have a lot better suspensions for what you are hauling, the end justifies the means on this.
the 450, yep it is wider, will turn inside the 250, 350 class of trucks. It will even turn inside my old k1500.
No use going less than a 4x4, why? I may need it at anytime. It's like cc or a pocket knife, it is going to be with me.