Camco Trailer Aid Tire Changer. This fast and safe tool makes changing a trailer tire on a tandem-wheeled trailer without unloading a breeze. Crafted from lightweight yet super-strong polymer, it raises the flat tire up by 4.5 in. for easy tire changing. Great for horse trailers, as you can change a tire without removing your horses. It keeps your cargo in place, simply drive the good tire up onto itself for a 4.5 in. lift.