We too own a 17ft Casita and are considering getting a bigger trailer. Our Casita is a fine trailer but we take longer trips (30 to 60 days) and it lacks the necessary storage space and has a cramped feeling after a while . Since there are only two FG trailer manufacturers that make trailer above 19 ft ( Escape
& Oliver ) , the choices are limited. One brand has a more reasonable price but has definite quality / build issues . The other has great quality and a high price to go with it. My wife and I are in our late 60's and spending the money on a bigger trailer at our age may not be a smart investment.
Spending 40 or 50 K on a trailer to have it sit in our driveway due to health issues is a concern . Just more for us to think about over the looooong Wisconsin Winter.