I believe, in FL, you can get a
<registration> for a wider load for only a small premium.
OVERDIMENSION
(d) Trailers or equipment towed with ball or pintle:
- Up to 10 feet wide OR up to 13'6" high OR up to 80' long - $5.00 /trip or $20.00 annual
NOTE: For weights over 80,000 pounds (like Karl's new box) add an administrative cost of $3.33 for issuance of permit