We have a rear kitchen, and as mentioned, you quickly learn to pack things well, especially the refrigerator. We pack kitchen breakables in plastic containers on the floor under the table, when travelling.
For us, the advantages of this layout outweigh the disadvantages. We have a large LCD television with a surround-sound system in an entertainment unit which is just ahead of the axles, and I would rather have the kitchen subjected to the rough ride than the electronics....the dishes can be stored away as mentioned above.
Shocks on the trailer axles help a lot...these are available as a retrofit kit.