I know that wire shelves are cheap and light compared to other shelving materials, and this is probably why RV manufactures use them. But for something that is in motion almost daily, things get knocked around. This is especially the case when they don’t have a firm bottom surface, and a way to keep them upright if the drawer isn’t full. 
Our particular wire baskets also have a wide U shape so things would be tippy even with a solid bottom. I will also admit to being super sensitive to noises, so hearing items fall over and swim around a cabinet isn’t going to last long.
One of the projects we did was to try and resolve this issue without ripping out the current configuration. We initially thought about plexiglass but found it rather heavy (and rather expensive). Additionally, it would require a tool to cut it. In Home Depot right next to the plexiglass was a sheet of polypropylene which was sturdy, light, cheap and could be cut with a box cutter. Perfect!
We cut it down so it fit the bottom of the wire basket snugly, and then used small bungee cords to have the ability to partition off the space when it wasn’t full. Perfect looking? Not so much, but we are hoping it cuts down on the noise & frustration. It also looks like it could catch smaller messes that we can wipe up, instead of it going all of the way to the bottom of the cabinet.
Next up is to try & find uniform spice jars that will fit snugly into a wire basket – a girl’s gotta have her spices!
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We use plastic baskets. They already have bottoms and if something spills, they tend to hold it in the bottom of the basket because the sides are thicker than a wire basket. The bungee isn’t a bad idea. You’re learning quickly about keeping things nice and secure. I say this because some friends of ours just bought their first rv and watching them pack their cupboards made me cringe. David and I tried to tell them about things shifting and not staying put, but they didn’t seem to buy it. They’ll learn this up and coming Memorial weekend when we go with them (separate rv’s of course) on their first outing with their new rv. I have a feeling they’ll learn real quick when they go to open their first cupboard.
Another item that is very helpful in cupboards is the thick rubber shelf liner. Not the cheap thin stuff. That won’t work. If you put the thick stuff on the bottom of your cabinets, at least in our case, things tend to stay put. We use Corelle Ware for our plates and such, which is hard to break in the first place, but this stuff keeps everything put. I also cut some strips of the thick stuff to put between all the plates, bowls etc. This keeps things really quiet.
We are very quick learners…usually!
Too bad you can’t have video running when they take their first quick turn or hit some railroad tracks! We just don’t like the rattle – we also put down heavy think shelf liner in the drawers and tacked it down with some museum putty (since we found it liked to slide around) The extra strips I am using to weave in & out of our glassware in the curio (also lined with thick rubber shelf liner). We both aren’t big plastic cup drinkers and the only time wine or whiskey should be put in those is one hell of an outdoor concert! I was going to do a post about that stuff once we make our longer trek through Savannah & Charleston to see how things hold up – esp the glassware. Since it will be our house – I want things as ‘normal’ as possible which means calphalon pans, wustoff knives and real drinking glasses! 
“a girl’s gotta have her spices!” lol I said that to my husband last night!
We just moved into our MH and I’ve been searching for a spice solution as well. Currently I have a huge ass spinning spice rack that doesn’t even fit on the counter. I’m thinking about a magnetic rack mounted on the wall but don’t know how well they’ll stick while driving down the highway! Just found your blog btw! 
Congrats on the move into the MH! We can’t wait, but at the same time we are glad to have some time to modify some things. I had thought about a magnetic rack, but we just don’t have a lot of wall space and I had visions of the cats thinking parsley was catnip after it fell. I am pretty sure we are going to put the spices in one of our pull out wire shelves, but that is TBD depending on what I find. Either way, I am going to have to downsize my spice collection which makes me a little food sad. Thanks for the comment & can’t wait to check out your blog!