I've read many other threads here about towing small boats with small
cars. The information has been great: safety, overloading
transmissions, just getting a boat up the ramp! Now, I've got the same
question, with different inputs.

I am looking to buy a 16' trihull (fiberglass) boat with 75HP Mercury
outboard and EZ Load trailer. I think the boat actually measures 15',
and the model is the National 150, implying that it's 15'. It's a very
narrow boat. The reason I mention that is that I'm trying to make the
boat sound lighter! The rated capacity of the boat is 1,411 lbs. for 6
people at 150 lbs. each and the motor, which I assume means 511 lbs. is
the max motor weight. I don't know how much the whole setup, boat
motor and trailer weighs, though I am trying to find out.

I have a 1997 Audi A4 1.8L 4 cylinder front wheel drive non-turbo
non-quattro car. It (obviously!) doesn't have a tow package, but I'd
get a Drawtite or Reese and install it. The rated tow capacity is
1,400 lbs.

So- can I swing getting a 16 foot trihull with 75HP Mercury and tow it
behind my Audi?

Related questions: does anyone have any idea how much the boat I'm
looking to buy actually weighs? My best estimate is: Mercury 75HP, 380
lbs.; Boat, 750 lbs.; Trailer, 250 lbs.; total weight 1,380 lbs., not
counting stuff in the boat. It's hard to find weight data on
fiberglass trihull boats, though- does anyone know what is the weight
range, very generally, for 16' fiberglass boats?

Thanks!
David