Here's an "as shipped" weight sticker on a 2018 355MBQS, looks like the GVWR is 14,995lbs:
As far as height, couple references I found for both 2017 & 2018 models state 154" to top of A/C.
I would be careful when referencing published pin weights ("unloaded" hitch weight), most FW "loaded" pin weights average 20% of the FW's gross (loaded) weight....., actual loaded pin weights range 20% - 25%...., depends on one's loading habits.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)