1/2 ton pickup + 6000 lb TT on 5000 mi western trip

I am currently at Glacier Park in Montana. 2.5 months into a 6 month trip. From NW Arkansas to Carlsbad to Santa Fe to Las Vegas to Yosemite, then north through Idaho and then east to Glacier.

My TV is a 2005 Yukon (5.3L, 3.42 rear end) and a 5500 pound TT.

I have not had any real problems going up or down any any of the passes. Yes I did slow down to 30 in first gear on a couple of 5 or 6 mile 8% grades, but mostly maintained hwy speed on all of them.

You should have no problem with your rig.