My opinion ... first of all, towing at the max capacity is not a great idea
.... stability will be poor, tow vehicle will likely not survive many
outings, ... For comparison, I have an older 19' fiberglass runabout with a
Mercruiser V6 I/O on a trailer ... total weight boat plus trailer about 3000
lbs (the trailer's 600 lbs) and I tow it comfortably with a jeep with 5000
lbs capacity. I would not be comfortable pulling much more than the current
3000 lbs with the jeep. If I get a bigger boat, I'll trade in the jeep on a
truck to trailer it.

- boat + trailer + engine = 2700lbs (towing capacity of my vehicle)