We have a 2012 Expedition 38S with a full wall slide. 

When we first park the MH it seems pretty stable on the jacks, but after a few days we start noticing more movement as we walk around.  I always level it before putting out the slides as the manual says.

I suspect the weight of the full wall slide is affecting the stability of the motorhome.

I'm wondering if some supports under the full wall slide would improve the situation.  I've seem some messages on other RV sites where people are pretty much against slide supports but I would like to hear from some Fleetwood owners.  Anyone use slide supports?

Harv