Update:
Well, today I picked up our 2016 333MKS from the dealer. On the way down I weighed my truck at a CAT scales; full fluids and two passengers (myself and my dad), no hitch, no trailer.
Front 5140
Rear 3260
Total 8400
About a week prior, I had weighed my truck at a different (non-CAT) scale and with full fluids, and just myself (no hitch) my weight was:
Front 5020
Rear 3200
Total 8220
A difference of about 180 pounds (my passenger on the second weight)
We spent about 3 hours at the dealer, did the walk through, found a couple minor issues, waited for them to install the hitch, hooked up, took a test drive, signed a few pieces of paper and left. The truck (stock rear suspension) only dropped a couple of inches with the trailer connected and off jacks.
This is my first 5er, and while I was apprehensive due to my concerns of weights and such, the tow home was relatively uneventful. I didn't feel any chucking or anything to cause me concern. I stopped at the same CAT scales (as earlier in the AM) to get my weights with the trailer.
I topped off the diesel (but not DEF) and still had a passenger. with the trailer (dry, except the dealer installed two batteries, and filled both the 7 gallon LPG tanks.) and hitch, these were my weights.
Front 5180
Rear 5540
Trailer 8720
Total 19440
Used on my math, the hitch and pin added ~2280. Figuring the hitch setup is about 300, puts my dry hitch in the 1980 range. That puts the trailer about 10740.
I increased my integrated trailer brake gain and used the factory engine brake.
All-in-all, it felt steady, didn't feel like the truck was struggling or lugging and stopping and handling felt comfortable. Granted this was only about a 90 mile trip, but gave me a good start.
However... I had to trim several trees along my driveway to allow for clearance.
I set it up on my driveway and opened everything up, opened the windows to air it out and show some family. During this time idiscovered the worker bees at the dealer FORGOT TO PUT THE SHORE POWER CORD back in the unit, so I have NO WAY to power the unit for several days.
I called the dealer and they had the cord and will be shipping it to me. Fortunately I won't need it for a about a week. Needless to say, had I been taking it camping and arrived at dusk and discovered I was without power... :M:M