Gm 5.3 vs 6.2

Congrats, overall you are better off with the 2500HD. The 6.0 ain't no slouch, and combined with the 6 speed it makes towing much better. Now when you hit the hills, I use the toggle switch to control the gearing. I still leave it with tow haul on, but like the ability to control the gearing. I always lock out 6th gear anyway, I mean in Florida you could pull in 6th, but it won't stay especially with my 5th wheel behind it. I generally pull in 5 th and in the hills Georgia I find 4th and 3rd at times. Only a few times in the Carolinas that I was in 2nd but you could not go fast anyway do to the road conditions. Normal interstate for my truck is 5th gear. The only mod that I have done to my truck was having it tuned by BBP. I like the new engine/ trans mapping and much less TQ management. The truck feels much lighter on its feet now and while towing the performance is noticeable. MPGs to expect empty are for me: 13-15 city, been getting 15 now since the tune, and 17 hwy both empty. Towing prior tune was 7.5-8.0 now 8.5-9.0 here in Florida. I pull generally around 65-70 and have no issues. The tires on the fifth wheel are rated at 81 miles per hour but it will never see that. Anyway great choice, it will perform very well and plus you have room to move up if you get the new camper desire. For me I'm starting with the current camper and looking for an antique camper to restore and pull with the C10 on short trips...but that's a whole nother topic when I get rich and famous enough to afford it...lol. BTW enjoy the Fort, we have been there several times for that cool experience, I only live a little over 1 hour north of there, but my daughter enjoys it.