Herpa Models 48' Livestock Trailer, Silver, HO ScaleNew Herpa 48' Livestock Trailers Add Realism to your Highways and Packing Houses. Based on trailers used across the continent to move livestock from ranch to market, these assembled models form Herpa are just the thing to add authenticity to your modern-era highways. Each trailer features a detailed plastic body with realistic see-through sides and wheels that roll. Trailers are available separately or in sets with a tractor.