Details in sig.
Reasons? Easy; Bigger trailer, bigger truck.
Although, bought the truck first to replace my rusting 88 k1500 Silverado with the 350 and then went trailer hunting. Knew we wanted a big trailer and I wanted a diesel so we kept this in mind while truck shopping. Then, armed with the knowledge of what we could tow, hunted down the trailer.
Didn't want a newer truck, I prefer the 88-2000 gmt400 looks and feel. Most of the newer trucks look kind of "cartoonish" to me (no offense intended) although they are all rated higher and have more "do-dads". My truck rides nice and fine for me and is smooth and tight as I keep up on reg maintenance and parts inspection/replacement before
things become a problem.
Then discovered the 6.5 was kind of weak as delivered from GMC (like 192 hp and something like 330 ftlbs) for the rated trailer weights ( we are close to the trucks max trailer weight, usually within 500lbs or so), but after some modifications (dyno'd 271 rwhp so around 300 crank hp and 440 ftlbs) pulls fine and returns 12-14 mpg with the trailer on the back. I'm into the truck part for about $18,000 including purchase price.
Last big haul was:
No issues after we replaced the original 400,000 km engine. That's also part of the $18,000.
I also just can't bring myself to pay $60,000+ that they ask for the newer diesels, no matter how good they are...