Did you already take that sheath thing off in these photos? Or did you just not run one? Wouldn't that be very harsh on the rear shock sand-blasting the rod and jacking-up the seals?
I take it off when riding the sand. If you were to leave it on within minutes the paddle would shread it. I did that on my last bike, forgot to take it off and by the time i remembered it was to late.
As far as the seals, im not 100% sure but as long as you keep everything clean after every ride it shouldnt be such a problem.
The biggest thing im worried about is the sand bleeching out my black wheels. If anyone has black wheels that rides sand alot please chime in and let me know if you have that problem. Thanks-