Hey, welcome aboard. We're from the Madison area originally, I'm now calling what had been our second home my primary residence, since retiring a couple months ago. I'm now in central WI.
It's been a few years since we've camped at Perrott state park. I also used to do a lot of business with an auto salvage yard up there, Elmers. Not sure it's still there. The owner used to have an extensive collection of antique cars, which he began selling off and then started collecting pedal cars! Years ago I travelled to the LaCrosse / Sparta / Tomah area frequently on business.
Let me encourage you to post often, and ask many questions. Someone here has 'been there, done that', and probably has the T-shirt to prove it.
Have fun. Yellowstone is a great place to visit. That reminds me, it's about time we get back there too. Too many adventures, not enough time or money.