carrying a boat along with trailer......any of you do this?

I have put a 14'jon boat on top of truck, along with 2 kayaks. I had a camper shell on also. a 15' would definitely be a lot of weight and would need the boat loader. call them because when I called, they said they were not making the frames anymore, just the loader equipment.
if you Google boat loader, you will find many pics
I mount my motor on the front of truck