Interesting! Here in Canada we have farm diesel it is dyed kinda purple. Really same diesel except for the dye and less tax! We can use it in our trucks on road (registered as farm trucks).
Also check your gvwr of your trailer. Here in Manitoba Canada if trailer is over 4549kg/10000lbs you require a class 3 drivers license. Exception is farmers/ranchers are allowed to drive operate a class 3 vehicle with basic class 5 license if it's registered for farm use.