I did the 865 on my 2013 gas F250 crew cab with the extra load capacity set up back in 2014 for a trip to AK. It was maxed out on weight pretty bad and the 865 turned out to be a bit heavier than I anticipated as we bought it with every bell and whistle made. So I took the back seat out of the crew cab and ran her with 1/2 to 1/3 tank of water (not to smart on Alaska Hiway)
I put stabil loads on which only took a few minutes but made a big difference. I kept a close eye on weights at the CAT Scales and made sure I had as much load carrying capacity in the tires as I could get -- and always watched inflation.
It was nice for a quick jaunt to go see relatives and stay in their driveway or for a quick weekend at the lake.
We had a great time and it did the job for the Alaska trip. But after 7 weeks in it on the way to AK and back the DW and I said "enough" as we were ready to kick the walls out of it. It just got a little too tight But man that mattress slept good though!