A Scamp RV trailer costs about $18k.
A 13 foot model costs $15k, that increases to $23k with bathroom.
They make a 16 foot long model that costs about $3k more.
There is a 19 foot model that costs even more, $32k loaded.
You can save some money by buying used. The price of trailers tends to drop 10 percent per year.
You can buy used models anywhere, including dealers and craigslist. I have seen them selling used for $5k-$12k.
Here are some pictures so you can compare the sizes: