JW,
I don't know what tow vehicle you have, but the bilstein 5100's really helped out the ride on my truck - F450. Airbags may help also, basically anything you can do to smooth that ride out on the rig as a whole.
A LOT of people are also reporting great results with the sumo springs for your 5th wheel. Again, anything to smooth the ride out as a whole.
I have not installed the sumos on our RW yet, but on our SOB the airbags and new bilsteins helped quite a bit.
Could be worse, At least your fridge is staying closed!