I use one similar to the one in the link. I only use this at home when I'm repacking wheel bearings and checking brakes, I also have 2 jack stands. The model I have is a 3 ton, depending on the weight of your trailer you may need a heavier one. When I'm on the road I have Good Sam emergency road service and I let them change the tire.
http://www.homedepot.com/webapp/wcs/...5X-_-100616375