In Minnesota collector military plates need not be displayed, but carried inside vehicle.
(c) Notwithstanding section 168.09, 168.12, or other law to the contrary, the owner of a registered collector military vehicle is not required to display registration plates on the exterior of the vehicle if the vehicle has an exterior number identification that conforms to the identifying system for military vehicles in effect when the vehicle was last owned by the branch of the armed forces of the United States or in effect in the year to which the collector military vehicle has been restored. However, the state registration plates must be carried in or on the collector military vehicle at all times.
Cool!
Also cool,
(d) The owner of a registered collector military vehicle that is not required to display registration plates under paragraph (c) may tow a registered trailer behind it. The trailer is not required to display registration plates if the trailer:
(1) does not exceed a gross weight of 15,000 pounds;
(2) otherwise conforms to registration, licensing, and safety laws and specifications;
(3) conforms to military specifications for appearance and identification;
(4) is intended to represent and does represent a military trailer; and
(5) carries registration plates on or in the trailer or the collector military vehicle towing the trailer.
Sweet deal!
Actually, that's just part of the MN law. Now, I'm no lawyer... but here's what I read right next to the quoted text:
Subd. 1h.
Collector military vehicle. (a) A motor vehicle, including a truck, shall be listed
and registered under this section if it meets the following conditions:
(1) it is at least 20 years old;
(2) its first owner following its manufacture was a branch of the armed forces of the United
States and it presently conforms to the vehicle specifications required during the time of military
ownership, or it has been restored and presently conforms to the specifications required by a
branch of the armed forces for the model year that the restored vehicle could have been owned by
that branch of the armed forces; and
(3) it is owned by a nonprofit organization and operated solely as a collector's vehicle. For
purposes of this subdivision, "nonprofit organization" means a corporation, society, association,
foundation, or institution organized and operated exclusively for historical or educational
purposes, no part of the net earnings of which inures to the benefit of a private individual.
Source:
https://www.revisor.mn.gov/bin/getpub.php?type=s&num=168.10&year=2007
I looked it up because I live in Minnesota and got excited for a minute... then realized that I'm not a "nonprofit organization". Bummer.