we went from a 25 to a 38 footer and sure felt the difference. Most parks will still be able to accommodate you, however the primo spots may not be available to you. We are about to make another move to a slightly longer 5th wheel, so obviously, as much as we love the best sites, we have made that choice. There are still wonderful sites to be had, no matter how big your RV is- you may need to look a little harder and sometimes take the lesser site, but having room for the amenities that we want with us is important to us.