Mammoth RZR camping?

Looking to do a trip here in the future. We have a 40′ motor home with a 16 foot trailer. We want to be able to camp and ride right to the trails in our RZR.

Can anyone share with me your experiences and knowledge as to a good camp ground?

And also which trails are good for families. We like crossing creeks under trees and views etc.

Thanks a bunch guys!
-gino