We ordered new rubbers for the rock hopper and put them on. The very next day we did a all day sand job about 10 - 11 hrs nonstop. Is it reasonable to have them new rubbers wore through in literally 1 day. I mean that sand ate through those new rubbers in 10 hours. Is this normal or is this extraordinary?

Spurious.

   That sounds a little quick to wear through those rubbers,, I guess the big rock hopper that you set on the feeder??

yes, the bobcat size hopper that sets on the feeder.

That is very fast. I have never experienced wear that fast, not even close. Are both supports that put the weight of the hopper on the rails intact?

That would be about the only reason I can think of, too much weight being placed on the skirts.

Check how the hopper mounts.  The same hopper is used on 105's, 110's, 80's and 130's.

All models but 105's require brackets for the blocks on the front of the hopper.  The brackets mount on the 2nd and 3rd u-rollers.  105's have higher rails and don't need the brackets.

Also, check the height of the rear bracket.  The bottom of the hopper must be parallel with the edge of the belt.  Different feeder tail section hinge points are at different heights, depending on year of manufacture.  Some hoppers  might require a bracket, which is bolted to the hopper to raise the end.

Factory skirts are not rubber.  They are blue urethane and they should last a long time. 

Again, the hopper bottom should be parallel to the edge of the belt.  The hopper should be high enough so the skirts are vertical, not "skrunched" in.