So I haven't updated this thread in a while, life is really busy and I have been having fun this summer.
I towed my RV to Virginia Beach and back to see family, was gone for almost 3 months. The RV weighs ~8500 empty and I have at least 1000lbs of stuff in it. The QX pulls it great and has outstanding brakes and good engine braking. The transmission will hold whatever gear you put it in.
In Virginia I switched rear coil springs to Moog 81085's because I got tired of waiting for the Dobinsons. In my opinion, the Moog 81085's are a required modification. The ride is so much better because none of the load is being supported by the airbags. It is an immediate and apparent upgrade, no more side-to-sides sway and no more rear end "wallowing" feeling. I am happy to have my normal driving weight now supported by springs instead of air, I do not have the airbags inflated anymore while normal driving and only use the airbags when towing.
Speaking of airbags, since I changed the coil springs and didn't want to try to remove the Firestone bags from the old coils, instead I bought AirLift brand bags. They are the 1000HD model for a Ram 1500. I went with these because the dimensions are in spec to use with our vehicles and also the material is thicker, they also include a spacer plate to protect the nipple (I 3D printed a spacer for the Firestones). Once I received the kit I was immediately impressed by the better overall quality than the firestone kit.
https://www.airliftcompany.com/shop/60818hd/
On the way back from Virginia I stopped in Ouray Colorado and did Imogene pass, very easy no issues at all. Nice and comfy too. I didn't have time to do Black Bear pass or any other trails because I had to work. After Ouray I stopped in Moab and hit a few trails by myself but didn't do any overly difficult obstacles because I was by myself. Also it was Monsoon season so it rained most days which made it sketchy in some places but still exciting. In the end, the views at Moab were outstanding as usual.
When I got back home to CA, I found the Dobinson springs on my doorstep.
I did not have a single hickup or issue towing such a heavy trailer, the engine and transmission never skipped a beat, not even up the "Ike Gauntlet" in Colorado. This makes sense because its the same Engine and Transmission they use in the TitanXD anyways, which is rated for ~12,000lbs IIRC. Also, this trip was during the summer during a very large heat wave, it was 110+ in some spots of Utah and Nevada and we made it up every pass without any hints of overheating.
Anyways, I am sure I am forgetting some stuff but I will attach some pics.