"So, you didn't do a before & after weigh in I take it."
Nope...not necessary, and what difference would that make to the subject? Thor did the weigh in for me when it was new. I didn't cram everything I own into it and the F550 chassis is not short on power, nor does that suspension come from the factory plagued with stability issues. I know how much weight I pack in and it's well within the limits. It handles very well but my point was how much of a difference the water weight makes vs. running with 1/3 or so of a tank vs full.
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie