As I approach "Codgerdom", I thought it might be a good idea to check out putting an electric tongue jack on the old bumper pull. Seems especially appropriate as I was hooking up yesterday in 97 degree temps. Being the mechanic that I am I have no idea what might fit my trailer. I see jacks that fit 2" and 2 1/4" tongues, but have no idea how to find out what size to buy. If anybody has any information about these things would appreciate the help. Also any recommendations on manufacturers?