Your trailer stats:
Shipping Weight 11999
Carrying Capacity 4351
(11999 + 4351 = 16350)
Hitch 2350
This is the shipping weight with the trailer empty.
Length 35' 0"
Height 13' 4"
For a 3/4 truck, towing a fifth wheel, this will probably not cause any sway or sway feeling. The height -- 13'4" is the same on pretty much all Montana models.
Fresh Water 66
Waste Water 49
Gray Water 88
LPG 60
Tire-Size ST235/80R16G
According to this site:
Click here, you should be fine (on paper).
Max payload: 3060 lbs
Max towing: 19,680 lbs
(if this is the right truck your getting).
Maybe real world 3/4 ton users will chime in.
From the numbers published, it looks like you'll be fine.
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2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually