RV storage units come in many different sizes, and they are typically advertised based on length. Keep in mind, though, that with indoor storage, width and height can also be quite important.
25-foot RV storage: This size is appropriate for smaller Class B campers, smaller Class C campers, travel trailers, toy trailers, and pop-ups.
30-foot RV storage: Medium-sized Class B campers and travel trailers can be housed in these units, along with large pop-ups and smaller Class C campers, and fifth-wheel trailers.
35-foot RV storage: These units will accommodate large Class B and Class C campers, large and medium-sized travel trailers, small and medium-sized fifth-wheel campers, large toy trailers, and small Class A campers.
40-foot RV storage: These units can store most RVs, including most types of Class A campers, large travel trailers, and fifth-wheel trailers.
50-foot RV storage: These units can be used to store even the largest RVs. This includes Class A campers, travel trailers, and destination trailers.