Ok, 7700# FULLY LOADED. Tongue weight needs to be 13% to 15%, so 1001# to 1155#. So, you are over your Exp 890# tongue weight spec. You didn't say if you were alone, or with family, and how many. TRhe four bikes worry me you see. That is important as your Exp rear GAWR will likely be exceeded, even if there are just two of you and you put all "stuff" in the TT.
Now if you do not tow with water you might be ok, but again, how many are you?
We tow with our Exp, and love it, but our tongue weight limit is higher. We NEVER tow with waste tanks full, and only carry minimal water. With just wife and I and 58# Aussie on board, we are VERY close to our TV rear GAWR. If we had kids also, we would be exceeding our rear GAWR.
Just food for thought.
