Try the "Balls of Steel" or "roto EZ" I have this hitch and I believe it is rated to 10,000 lbs. It adjusts 7 - 8 inches and also offers 3 different ball sizes all on one unit. It is stout, built from solid 2" stock with heavy gusseting - I think it weighs around 70 or so lbs. There is a # on the hitch - 800 995 9825. It is actually 2 dfferent parts, the adjustable hitch and the 3 sided ball mount. This thing is big, and mine is red - does a good job keeping tailgaters back too. I've been happy with it, but for most trailers it has to be dropped all the way down for my 4wd. It can also be flipped over and then used as a raised hitch for lower vehicles like my little motorhome.
Hope this helps,
Craig