RE: ThunderTiger Rare Bear
i can't say from experience because i have not had to do that (yet)
but the warbird guys swear by it.
they use like 1/8 inch ply expoxied to the rear rail.
it translates into about ~0.5 inch forward movement of the wheel if the strut is 4.75 inches long (retract base to wheel axle)
it translates into about ~0.75 inch forward movement of the wheel if the strut is 7 inches long
on grass, will it help - i wouldn't know. we have pavement.