Great pictures! I love this build. I will agree though that the Pentastar is not the engine I thought it could still be at altitude with a trailer. It was so weak. Did you spend all your time in 3rd gear on the way up?
Any idea what your trailer weighs in at?
Hey sorry I didn't see your reply sooner. I did a little under 3k miles in total on the trip and only used 3rd gear while climbing hills when it bogged below 60mph. 4th gear was good on most the flat highways. 5th was only used for coasting down hill.
The main thing that helped was just trying to keep momentum and keeping a very close eye on engine coolant temp, I hit 245° a few times and had to just slow down to 40mph or pull off the road completely to cool down.
I run 35" tires and 4.56 Yukon gears. I'm not sure the trailer weight, it felt like I was towing an anchor uphill though. Lol