I had a 210 WBS and the refrigerator sat rearward of the axles...not dead in the back wall as the UDS is. I can only guess, based on the "tumbled" contents that occurred sometimes in our WBS' rear pantry and medicine cabinet that most of the time
the contents will be fine, but, most of the time is just that. It will only take one pot hole, or off-angle driveway to give everything in it "rough ride". Spring loaded shelf protectors will be a must and I would expect things like salad dressing bottles, condiment bottles, etc. to be their sides; make sure the lids are on tight!
We loved our 210WBS, but, the rear mounted refrigerator would be a no-go for us on the UDS design. That is just a personal thing...there are many floorplans that have a rear kitchen and people do just fine with them. Takes a "special touch" in packing those rigs, but, it can be done and, with a little experimentation, many people do just fine with that layout. IMHO, you can't beat the stability of a center kitchen (that's why more floorplans are laid out that way) and that is usually what I look for in any RV.
We loved the walk around bed in the 210WBS, that and the sofa slide, were what sold us on that floorplan. Two things that are definite non-starters for us is a bed that requires climbing over each other for anything but "sporting events" and outside kitchen units.
We went to the Harrisburg RV show and the first thing my wife would say to a salesman that wanted to show us something was; "Does it have an outside kitchen? Yes? No thanks, what else have you got?"