It's too bad that making sure to stay under all the weight ratings of the tow vehicle can be a pretty complicated concept. It would be nice if it was as easy as staying below the "tow rating". Additionally, it can get real confusing and difficult to understand. GVWR, GRAWR, TW, GCWR and on and on can be a bit daunting the first time around.
Couple that with the plethora of WDH hitch brands, styles, sway controls and brake controllers and there really is a lot that comes into play before you even buy a TT.