Watersports towboats are designed to have great charcteristics for waterskiing and wakeboarding. Waterski boats have a shallow hull to keep the wake as small as possible. They also typically have tracking fins and direct drive inboard engines located in the center of the boat. The location of the engine reduces the underwater footprint of the boat thereby reducing the wake so that slalom skiers can cross it easier.
Wakeboard boats typically have the engine located in the rear of the boat and some have a sharper V shapped hull. The sharper hull creates a bigger wake which creates a better launch ramp for wakeboarders. Wakeboard boats are also equipped with towers to increase hang time for wakeboarders. Towers are great because they also provide a place to attach board racks and speakers.
Watersports towboat links:
Correct Craft Boats - awesome ski and wakeboard boats
Mastercraft
Malibu
Supra
Moomba