I'm thinking with the above numbers, you'll be close to good.
Not sure what side of good this would be.
Here are some things you should know or find out - yes it is a big deal.
Your going to have close to 900 lbs tongue weight.
Did you check your receiver to see what it is rated for?
Do you have a weight distributing hitch?
There is a sticker on the door jamb that says something like total weight of cargo and passengers should not exceed xxxx lbs. How many pounds?
Does the stuff the truck is going to carry - tongue weight, cargo, passengers, camper shell, exceed this?
What kind of tires do you have on the truck?
What tires are on the TT, and what is the data code on them?
How much does your "slightly modified ARE camper shell" weigh?
What other accessories does your truck have that add weight? The camper shell adds weight.
Google Cat Scale Locator to find one near you. Hopefully you have LT tires on the truck - make sure you fill them to max cold psi when towing.
Good luck.
