Amazingly, when we were shopping for our current MH we can across a number of 2013's and 2014's where the buyer purchased the new rig and then traded it back in within 6 months or a year of purchase. Talking with sales people I learned that often the trade is because they just didn't like the first purchase and traded back to purchase a bigger or smaller RV. I can't even imagine the depreciation loss that was taken.
The depreciation loss is probably huge. It is not that amazing. Some people don't care about depreciation, they only care about getting the coach they want. And if they keep what they don't want two or three years more they only suffer that much more depreciation in trade in value while watching the prices of new ones going up. Sometimes it is best to cut losses early on if you know what you have is not working for you.