Do you have to have an orv sticker to go out there just in a stock 4x4 truck?

Yes you do

I was told you did

Yes you can get them where they sell hunting license.

Just an FYI, the Mounds is closed to to trucks from March 15 - May 15 for spring thaw. Only quads and bikes allowed in the front scramble area

"Q: Is a State of Michigan ORV sticker necessary to enter The Mounds? A: Yes, State of Michigan ORV stickers are available at The Mounds for purchase." www.themounds.org