How much does the length of a TT affect driving?

we went from a 28' to a 34' TT and it was an easy transition- there was a learning curve and backing up took a little practice. after the first few months I was pulling and backing it with no problems (we had a Chevy 3/4 ton gas truck)
we stayed in all the sites we did in the past- we went to a few new places and had some tight sites but managed to get into them- my DW is really good at guiding me into a site.
make sure your tow vehicle can handle what your looking at- great advise above.