Thanks for the reminder!! I found it on page. 55
Shelters (From the regs. book referenced above)
The following regulations apply to fish houses, dark houses, and
portable shelters used on all Minnesota waters, unless otherwise noted elsewhere in this booklet.
• All shelters, which include dark houses, fish houses, and portable
shelters, placed on the ice of Minnesota waters must have either the
1)complete name and address, (2)driver’s license number, or (3)the
nine-digit Minnesota DNR number on the license of the owner plainly
and legibly displayed on the outside in letters, and figures at least 2
inches in height. Dark houses, fish houses, and portable shelters placed
on the ice for shelter while fishing do not need << NEW
a license unless the house will be left unattended overnight.
NEW >> Note: The Dept. of Public Safety – DVS now requires trailers
used to haul fish houses or dark houses and enclosed trailers or recreational
trailers used for fishing must be registered. See your local Deputy
Registrar for trailer registration.