The state that sells the most RVs is California. CA has always had a love affair with RVs. It is a very nature-oriented state.
Texas
florida
arizona
probably Florida since its the most tropical state
Genuine RV (http://www.genuinerv.com) sells used RVs in Nacogddoches.
Florida
California
Florida
Hawaii
Camping World RV Center sells used RVs as well as new ones for decent prices. You can also buy an old rental RV that people basically just took tailgating to NASCAR races.
Most trucks are capable of hauling RVs. To find out about specific makes, you would need to read the owner's manual.
Texas