We have 34' FW
I have gotten it in some pretty tight spots and length as been an issue
BUT the biggest issue has been height.lots of older cgs have very mature trees with lots of lower hanging branches.
They are more of a limitation then site length
AND CG tree lined roads...........windy road thru CG to sites with trees right at edge of road....makes for some fun maneuvering
Glacier and Yellowstone........we used CGs outside and drove in/thru with truck
Also did Red Bus Tour in Glacier (I didn't have to drive and got to LOOOOOOK!)