No. The surface should have good grip though, and should not be abrasive, better not bare metal.
I would rather keep replacing wooden ramps though, if he keeps using them as chewing toys, well, great, that's what rabbits enjoy doing. You could also put a replaceable sacrifice chewing board at the spots where he likes to chew.
I have wooden hutches, and such sacrificial boards at some of the doors, other parts I don't want chewed get treated with somewhat diluted rabbit urine, rinsed and dried, I think it works even if I can't notice it, their noses are so much more sensitive than ours and mine don't nibble soiled stuff.