you shouldn't be using fictional "dry" weights, especially with a Toyhauler TT. the actual tongue weight will be a lot more and maybe too much for your truck.
but the GVWR is 5380lbs., under your 5500 number.
but that's with only a 150lb. driver in the truck. anything else in the truck, including the bed and the WDH, will subtract its weight from your 5500.
if you have the factory tow package, then you'll have that 5500lbs. number. but not if you don't.
there's a number of 17RR owners here, maybe they'll chime in with some real world numbers.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC