These plates are used on off-road recreational vehicles.
I believe this type started in the 1970s with motorcycle-sized blue on white plates and an A prefix, working their way through B, etc.
All-Terrain new dealer plates are also issued, with in an X1 123 format. See below.
Click the photo to see this type in use.
1988 All-Terrain
1990 All-Terrain
1999 All-Terrain
2000 All-Terrain
2001
You can get a sense of how few of these were issued every year by comparing the numbers of the 2000 plate vs. the 2001
2004
When the graphic base was started, "All-Terrain" lost its hyphen and became "All Terrain". These plates began with the "G" series, and four numbers are now used after the letter prefix.
All-Terrain Dealer
These plates are used by all-terrain vehicle dealers
A dealer will receive plates with the same suffix number - e.g. X1 123, X2 123, and X3 123.
