Farmer Boots, Monaco must have changed the macerator system by the time we bought our 2008 Monaco Dynasty. Ours does not make hardly any noise, just a hum with a little grinding noise.
And, you must use the 'right' toilet paper. I found the regular TP at Walmart works great and dissolves really easily (I tested it first in a cup of water before I bought it).... it just fell apart when wet (perfect!). It amazes me that COLEMAN camping toilet paper is $4.99 a four pack....Walmart paper was less than $1.50 if I remember correctly and larger rolls too! LOL!
Safe travels,
MM.