Well...the snubber didn't survive the test. I've readjusted the tail cone so I won't have to worry about having a snubber. Good riddance, I say! I added in some extra support on the attachment rail so it won't flex and the tail cone will stay in place better.
I've loaded the tail cone with 2x4 pieces of wood fer weight to see if I can keep the air from moving it around...just in case. They are attached to the main spar and to the sides. I'm estimating the current weight of the tail cone is about 5lbs or so.
The tail cone adds about 14" more to the back end of the trailer when deployed or stowed. Clearance to the ground from the front is 4" while the back is 5.75". The bottom skid plate is 16" long.