So we actually have a bad weed problem in our Creek, and one neighbor isn't physically able to keep up with manual removal, so he's willing to spend everyone else's money for treating the water with chemicals.
I have a generic version of that weed razer, as well as their Muck Razer, and a rake for removal. Two other neighbors have the Weed Razer. I will report back to you about whether or not towing it would work, but I can definitely point to it not being that simple, given the size, and how things don't seem to work as perfectly in real life.
There's an underwater "fan" or blower that works spectacularly, for an outrageous price, and it IS limited in distance. The touristy areas in my state use these with great effectiveness, but I see them as a Thurston Howell accessory. P.S. You're old if you get that reference.
@Coult45 I'll shoot you some pics, and let you know how my stuff works. At the end of the day, that fan/blower might end up being quite cost effective