what about a mudtire shaped trophy with the class on the inside where the rim is.
or maybe this is too cheasy, a tire cover ( a good one) with the award on it that way everyone can see it not just sitting on a shelf.
petersons gives a ring and pinion style trophy to 4x4 of the year.
or a larger version of the jeep show dash plaque with the class imprinted on it. that way each year is a different trophy.
but if the plaque is made jeep show specific, you cant have extras.