Can I use a 45 ft fifth wheel

There are several sites that would acomadate you but the size limit is 35 feet

Technically NØ... They don't check strictly... However, it is outside the camp rulesthe..

No

Technically no, the park has a 35' limit. I have seen rigs of that size in there but only some sites would accommodate that size, and you will not know until it's too late. There is always the risk of the kiosk deciding to measure and turn you away, however not likely.