Hey all! New to the group, but have enjoyed the forum for awhile from afar.
I have an 08 denali that I turned into my amateur overland truck.....I caught the bug 2 years ago after a NETFLIX series.
It is OEM. Factory suspension and tire size (265-65-18) handles gravel roads with ease. I've been to WY where the roads are mainly smooth gravel and 28 psi works well to go around 45 mph with good riding conditions. MO, KS,and NE roads as well (pony express overland route) were mostly gravel and easy to run on.
WI forest roads that are gravel with some whoop sections and washboard are easily traversed with the appropriate speed and tire pressure.
AZ & CO just this week and it was much different than what I had previously tackled. The roads can either be nice gravel/sand mix and smooth, or cobblestone awfulness that will rattle the truck apart. (Avoid Carson natl forest if you value your vehicle in 1 piece) I found it can also handle a trail that goes to 12000 ft elevation in the San Jaun Natl forest ( shorter red loop on RH screen shot. Hwy 550 is the western border). Steep, rocky, sharp corners, loose rocks, etc. It was pucker central for a little bit, not gonna lie.....especially traveling all by my lonesome. A 2 speed transfer case would be great, but 1st gear will be sufficient for the most part. Just make sure to give the brakes time to cool after steep sections.
Also did the CUMBERLAND PASS trail from hwy 50 south of Pitkin via 763, and then 765 north over the pass to Tincup. I would call it a semi-rough route with some nice smooth gravel sections, then washboard, small to medium rocky sections, and some sharp uphill curves.
If you air down the tires to help absorb energy, choose a good line, and don't be a speed demon, it actually works quite well. I do have the rear shocks refill after a serious articulation around steep corners once in awhile, but no failures or leaks. However, I was advised by more than 1 person that the low ground clearance and factory tire size can get you in trouble on other trails that are more technical. And, I don't disagree with them.
Put on 3200 miles in 6 days from WI to CO and back with offroad exploring included. Testament to good engineering with proper maintenance.
Always looking for adventures if anyone wants to plan a Yukon outing play date....LOL