Eddie, the tailwheel spring issue stems from when you fold the wings back over the tail for transport. There is considerable more weight on the tailwheel than when landing or taxiing. Don’t believe me? Fold back both wings then try to pick up the tail. Don’t throw your back out. The transport tubes welded crossways into the tail are there on purpose. Years back we saw a few earlier models get broken vertical tail posts from leaving the tailwheel on the trailer deck during transport. Newer models are even heavier on the tails.
Proper securing to the trailer is very important too. Tying the tires down to the trailer so the landing gear remain active and absorb some of the road shock is the correct way.

Look at the photos of Ken Nougaret’s trailer (post #9 in “Loading and unloading a Kitfox SS7” a sticky thread) for the best way to transport on an open trailer. Pay attention to how he unloaded the tailwheel with brackets and how he lashed the tires/wheels to the trailer.👍 This can be duplicated on a flatbed trailer also.