Sounds like a perfectly reasonable load for that trailer. Kayaks will spread the wait out very well and the bikes are not that heavy you're ratchet handle that without any problem.
If you are anywhere near the tow capacity of your TV,you should go for the weight distribution rig. 2700lbs is not particularly big. I had atv and trailer within 800lbs of max and the WD worked perfectly. Nice flat ride.
MarineTex. Comes in white (for fiberglass hull repairs) but is a first class epoxy compound that will not yellow. Used it on my aluminum Jayco top with great success.
Welcome. Hope you enjoy it as much as we do.We love the connection to the outdoors you get with the PUPAn awning and good sturdy folding table are things you will really appreciate. The screen house is a PITA to put up but if you stay in one place ...