kw/00 wrote:
I think you should be fine, I had at one time a 2000 5.3 1/2 ton Chevy and pulled a small fifth wheel 6500-7000 lbs dry without issues. My GVWR was at the max back then but no issues. Going from diesel back to gas will be a change but I have pulled with both and have no issues. I pull 10K with a gas job and so far any mountains I have run into up North I have had zero issues. Just drop a gear and go. The 5.7 Hemi my Aunt has in her 2500 Dodge pulls the hills fine, and she pulls around 10-11K.
Northeast mountains or northwest mountains?
OP wants to tow in Colorado. All the stuff back east is foothills compared to the mountains out west.