Picking up a used TT with equalizer (not mine) what to know?

Lynnmor wrote:
You only need sway control if the tongue weight is too light. Looking at the specs, I would drop it on the ball and go home.

It is a 2012. Look like the dry weight (listed online) is somewhere between 3400-3600lbs and the hitch weight is about 318 lbs + 60lbs for batteries? and 50 lbs for 2 mostly filled propane tanks? So 428/3500 = 12.2% tongue weight? Is that alright?

TV is a 2014 Ram 1500 Crew Cab Outdoorsman with the 6.4' bed.