The table is low, even when the unit is new. Mine has never bent down on ours, regardless of the size of log dropped onto it. Shucks, it won't take anything bigger than 12", so that shouldn't hurt it. The table is low for several reasons:
1. It's a lot less work to lift a heavy branch onto the feed table when it isn't too high.
2. The low feed table points somewhat to the ground, where the rest of the branch is laying. This allows the butt to rest heavier on the bottom feed roller, assisting the spring tensioners to pull the log in.
3. Pointing the feed path to the ground also reduces the tendency for forks and irregularities to hang up as the branch is dragged into the chipper.
4. A mild downslope is good to have when you are trying to prevent something bad from rolling/sliding/vibrating further towards the feed rollers.
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Leave it on. Without it, somebody will get mulched by being too close to the feed rollers, and you will loose everything you own to lawsuits for removing the factory equipment.
Besides, that feed table is a good tailgate, and you can store the last of the tools in there when every other component of the truck is stuffed. We routinely finish blowing off the street, set the handheld blower in the chipper, and drive off. Besides, without it, you will have a sharp edge that will hang up on every branch that you try to feed.