The Hagerty Plus add-on (now called the High Octane level policy) is a fixed cost for all vehicles in the family - no vehicle limit.
That includes flat-bed transport of my 18' bed 54/55 GMC 2-ton COE.
I do not worry about carrying many tools (or spare parts) when I drive a truck to a show within 125 miles (the distance-limit has changed to 125 miles).