Our Raptor had it under the front bedroom, as does our Motorhome now. I can hear it running but its not enough to bother me. It really depends on which generator is installed IMHO. We've had the Onan 5500 in our past two units and its very quiet even standing outside. However a friend had a 5er Hauler with an Onan 4000 and you couldn't stand outside while it was running and talk at a normal volume.
If you are out shopping, ask to have them run while you are in and out of the RV.