Welcome!
I am probably the wrong person to get started on this subject; as there are several leaders/orgs. in our off-road community who would like very much for you to send them in some membership money...but who would call you every name in the book (later) should you stand and fight on width (or god forbid 'weight') access-related issues.
Don't modify your rig and it's 50" here in Michigan...yet even with the largest maintained system in the nation (very poorly maintained/disjointed) we head to Canada; KY;TN or WV (
www.trailsheaven.com).
As you've probably already learned; we never fight just the greenies and the govt. in this sport...as even your own fellow off-road community members will strike out on their own; stab you in the back and shut down a system to "only me" just as quickly.
