I have a 1997 Liberty Prevost conversion. My wife attempted to flush a tampon in the toilet (she knows not to, but we've been away from the bus and she's gotten used to "normal" toilets, so she did it without thinking) and it just didn't finish the job of flushing. The water just kept raising and I ended up turning off the water pump to prevent it from overflowing.
After doing that, we've tried to use a plunger (which Liberty told us to do the one other time it wouldn't flush). This was a mega plunger like you've never seen (ergonomic grips, amazing seal system, central red thingie to help push crap down, etc.). That didn't change a thing. Whenever we attempt to flush, we never get to the point of hearing the normal stream of water pushing things along and instead mainly notice the water level in the bowl raising. Once it gets near the rim, we shut down the water pump and then use a bucket to bail the water down to a managable level and then try again.
Any ideas on what we should try next?
If it was Monday, I'd just call Troy at Liberty and he'd tell me what to do. But, alas, it's Sunday and we're parked in a ghetto RV park where we'd rather drive somewhere instead of using the bathrooms here.
P.S.: If you want to see just how far toilet plunger technology has advanced, check out the plunger we used:http://www.amazon.com/Roto-Rooter-RRWP01-Instant-Plunger/dp/B00919TXRM