Ah hell I don’t mind it’s off the rails even 1 bit. I too pull 2 large tubes at the same time (4 kids) and yes, it really drinks the gas for sure! I have 1 of those ball things I used to use when I would pull them behind (yes) a large twin engine cruiser. I only have 1 ball though and I don’t think 2 tubes would work with it. I have enough crap to tote and blow up just with the tubes so I’m likely not getting a second one.

I set the cruise to 20 mph so I don’t accidentally wind up pulling them too fast.

I have also seen a lot of people hooking ropes to the tower but I think that’s a no no.