Thanks for the ideas and contact information!

Tim, the URL you sent me off-line for the Tree Straps appears to solve
that part - https://www.expeditionexchange.com/straps/
Thanks!

It just occurred to me that if the canopies are off, it becomes
possible to connect inside the fuselage - perhaps a strap under the
front drag-spar carry-through, just behind the back seat. That would
be more elegant in appearance (the overall goal) than big straps under
the belly and would put the load where it was designed to go. It could
even run under the spars I guess, with a little forward triangulation
to allow for a vertical exit.
Frank, you're right that a strap a foot or so ahead of the main wheel
would make the tail weight more than 50 lbs.. It wieghs 45lbs just
sitting on the main.
Hmmm....

Don