Ontario (MTO) towing regulations & truck campers

The only specific knowledge I have is when I bought my 2004 Ram 3500 brand new, I had it registered at GVWR. I got pulled over by the MTO and was asked for my log books, etc. I explained to the officer that I use the truck for my RV (almost) exclusively. He said "If you had your RV, I wouldn't even have looked at you". I lowered my RGW to 4400kg. When I bought my Chev with much higher GVWR I registered it at 4400kg. Even so, I still have to pay $181 per year for license sticker.