Hat Tip to Val M.
Things to avoid at New Hampshire Motor Speedway: hitting the very rough curbing, which has huge holes at some key turns: going up the hill at the trackout after Turn 3, at the inside of Turn 8, and at the trackout after turn 11b. Here's a map of the track to help you identify these problem areas:
Areas with holes in the curbing highligted in red
The rim above was bent by a very unfortunate car which tracked a bit wide and hit the hole coming out of Turn 11b. Both the front and rear passenenger side rims and tires were severely damaged - a small but very costly mistake!