I thought about a diesel too, but for the 6 times a year I tow my rig, the cost didn't seem worth it. That's why I opted for a 6.0 1 ton express box truck. I can tow and sleep in it. I'll find out how good it tows my junk next week to Harlan.
You could always get a 1 ton express van so you and your doggies would have plenty of room. Unless you're looking for a daily driver with more than 2 seats...