If your in another state that requires something your state does not require, technically you are exempt from being charged or convicted of that particular equipment violation. And I'm only talking about vehicle equipment.
I disagree. There is a nuanced argument here that is not really appropriate for a Jeep forum, but I'll give you the Cliff Notes. The Privileges and Immunities Clause does not give you the general ability to take your state's motor vehicle laws with you into other jurisdictions. When you are in another state, using their roads, you are subject to their laws.
There are some exceptions, but the only one that immediately comes to mind in non-commercial circumstances is for emissions standards. There are also circumstances where other constitutional provisions control, such as interstate commerce and the Dormant Commerce Clause, but they tend to deal with trucking or other commercial enterprises.
For all of you who think there is some grand law immunizing you from another's states motor vehicle laws, I challenge you to find that law of the land and post it here. I will appropriately eat crow if necessary. But please, please, please, stop relying on something you read somewhere online or something your brother's nephew's cousin once told you after slamming a six pack of Bud.