Since you haven't gotten many tube-towing ideas from the experts, here's my
suggestions:
As has been said, I would never use the bumperetts to tie my amphi to a
trailer. And towing logs off a beach doesn't sound like a good idea either.
But, I think towing a tube in the water will not put nearly that much stress on
the bumperetts.
To improve your ability to steer in the water, tie a bridal between the two
bumperetts. I'd recommend that you use a rope for the bridal that is at least
twice as long as the distance between the bumperetts. Tie the bridle rope
right above the attachment arm of the bumperetts. Shorter bridle lines will
cause greater forces on the bumperetts. Tying higher or lower on the bumperetts
will likely pull the bumperetts crooked. Using a pulley on the bridle (like
you see on many ski boats) will also improve your steering.
Also, I'd recommend you use polypropylene rope (it floats) and a float for
the pulley. This will help keep the lies out of the propellers. But, still
DON'T BACKUP!
If you still are concerned about bumperetts, then use the same method
mariners have used for ages to keep things from ripping off the deck -- backing
plates! Cut 4 plates that are around 8 inches long by 2 1/2 inches wide. Round
the corners, and drill holes to match the bumperett bolts. Install one plate on
the inside and outside of the hull at each bumperett. Something like 3/16
steel or 1/4 inch aluminum would be about right for the plates. Oh ya, seal the
outer plate with something like 3M 5200 or Boat-Life sealant. These are
designed for "below waterline" use.
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