Wow! Mine is a DiamondShield on a 2005, and is still pristine, even with a couple of chips. One was from a u-joint! I just filled them in with clear acrylic, and no prob.
I guess it helps that I live in the desert, but have been all over the country with this rig.
2005 Georgetown 342DS XL, Full Banks Package
2005 Liberty Renegade 4X Toad
1989 Wrangler Sahara Toad
1984 19.5' Beachcraft i/o 5.o liter, 4-bbl (and you thought your Moho sucked gas!)
D/W Carole and Maggie the Teacup Lab (Black Chihuahua)