I remember talking a little about the roads and toilet when we were at PLSP with you.
FWIW, PA I-84 west is considerably worse than the eastbound side and, generally speaking, PA roads are among the worst in the nation. Poor funding, lazy 'coffee-clatch' PennDOT workers, frost heaves and the biggest crop of all things growing in the state - ROCKS! Especially in northeast PA. Seems no matter what you do, you can be assured of another crop the next year.
The only section of road I've been on that makes PA roads seem acceptable is I-80 east over Donner Pass (and the westbound side is no pleasure either). Heck, part of the reason we prefer secondary roads is because the Interstates are so bad. And, in a few states you have to pay for the privelege of shaking your equipment to death.
Hope you can get a new seat from PC quickly. Having to buy a new toilet just to get a seat would not be a good thing.