You could tow a Mac with one of these. I'll have to try. They tow water toys and skiers with them all the time. It's way too much HP though. It's a 4 stroke so it should tolerate low RPMs for a while. Our son followed us at low (non-planing) speeds for miles.
A supercharged 215HP motor is not a fuel efficient beast. I read at WOT it consumes 18GPH! Although it's virtually impossible to run it at WOT because it scares the daylights out of you going that fast (70mph). It has a special key that limits the top end to 45mph for "training".
The other ski only has 115HP and is much more manageable and would probably work better as a utility boat.
I've never owned a PWC before and have learned a bunch about them. Towing a PWC at high speeds requires the cooling line to be "pinched" so as to prevent water from backing up in the heads. It slows our Mac down slightly (1 mph) while towing it. They can flip over and remain buoyant. Lots of real (molded) foam in there. They have built in bilge pumps (when the motor is running) that suck water out of the bilge. In fact, everything seems to be run from the jet pump, bilge pump, engine cooling, etc. The jet pump has no transmission, it's always engaged. There is a cup that will divert the jet down (neutral) or back (reverse) similar to the way aircraft jet engines stop. I'm amazed at how easily maneuverable it is in the marina. Turns on a dime thanks to little flapper rudders that drop down at low RPMs.
And yes, I suppose you could "dock" one with another boat.
--Russ