Sorry to hear you had issues with both trucks. I agree both trucks will get the job done. I think as a whole, the diesels are more problematic. I replaced (2) DEF tanks, and (3) nitrogen sensors with my last truck. Now add in the potential for CP4 injector pump problems destroying your fuel injection system and the EGR valve ($1,000 repair) it kinda makes you a little apprehensive. I think the fact that you went with a gasser for your business truck speaks volumes. I would have gone the same route and saved myself $10,000 in the process, along with much cheaper fuel and maintenance. Even with the added costs and more expensive problems, I still like diesels. Just hope they would straighten out the emissions. but right now, IMHO, gassers are the way to go .... unless you pull heavy and frequently. The gassers get it done.
I used to pull a 11,000 5th wheel with my diesels. I now tow a 7,0000 bumper pull trailer. The mileage difference really surprised me. Pulling that 7,000 trailer on average I got 12. to 13 Mpg. with diesel. with my gasser pulling the same trailer 10.5 to 11.0 not a world of difference there. I thought I would miss the exhaust brake but not that much. The gasser trans in the tow/haul mode is pretty good.