Using a classic vehicle to tow a boat is one of those things that's fun to talk about but horrible to put into practice.
Mainly because it's a '70s wagon... I mean, seriously. A 30+ year old vehicle to tow a boat? I'll pass.Why would it be horrible to put into practice? Most of the 70's wagons had disc brakes and came pretty loaded from the factory.
My family had a 1973 Chevy impala station wagon when I was a kid and they used it to pull a camper all the time. It had a 454 with a turbo 400 tranny. It had pwr windows, locks, seats, cruise, air, tilt. It got like 10 mpg but could pull anything a truck could. It weighed over 5,000 lbs too so it wasn't like the trailer was going to move it around.