It is not going to be any huge problem at all.
I went from 26 foot fifth wheel to 35 foot fifth wheel back in 2003. Had already been using the smaller fifth wheel since 1996. The BIG learning curve was with the first RV.
Changing size is no big deal, once you've already got some fifth wheel experience.
As far as camping sites go, it is really minimal difference. If you could get in with 33 feet then five more feet is NOT gonna make a huge difference or lock you out of a lot of places size wise.
It is not like you were doing fine with 33 feet then OMG what am I gonna do with the extra 5 feet kind of thing.
As I said, if you fit with 33, you've probably got enough room to do a little more. So don't pay attention to naysayers about getting locked out of spaces you probably would never have used in the first place.
