4x4 vehicles can go over 2" but there is some weird formula that determines how high. Something about wheelbase, I forget. I would think a 3" on a JKU would be perfectly fine.
Townsend is usually the go-to for professional stuff. I think there is a place on Franklin St. that does jeep stuff. Have seen the garage but haven't gone in to talk to anyone. However, there are A LOT of jeepers around here that will readily give you a hand with doing stuff yourself. They will even bring tools and everything. I keep telling RubiconRich to get ready to help and then I never end up buying my lift.
Dudes gotta be exasperated with me.