I don't know about the 40 foot, but with the 45 footers you have to pick your stops. You get used to it after a while knowing where to stop and where to park. In my previous class A coaches , a 38 and a 42 footer,I could park inmost large parking lots or on the side curb of roads. The 45 footers you will have to watch out for curbs, islands, poles etc. a little more.
With State and Federal Parks the 40 footers will have an easier time, it all depends on where you want to go I guess.