I recently bought a 1985 K5 Blazer Silverado, and I'm trying to get a better grip on a few facts. The Glove Box label lists, among many other codes, RPO Z82 "H.D. Trailering special equipment". I was wondering what that "Trailering special equipment" consisted of in 1985. Would that include a bigger radiator and a transmission cooler? It's an RPO MX0 700R4 truck. Are there any other goodies in the Z82 bundle? It does have UA1 HD Battery and GT4 3.73 axle ratio listed on the sticker. My appreciation for any info on this package. I have ordered a large 1985 Blazer dealer brochure that might tell me something when it gets here.