What I have done to level my dock that is supported by 2 1/2 inch diameter pipes with permadock brackets. I went to the junk yard and bought an old fassion bumber jack. I drilled a hole about 3 inches up from the bottom of the
jack and put a bolt thru the hole.Then I put the jack in the top of the pipe, the bolt stops the jack from going more than 3 inches into the pipe. I then wrap a chain around the permadock bracket, and attach it to the working end
of the jack. I then loosen the bolt on the permadock bracket and jack the dock so it is level. Then tighen the bolt and move on to the next bracket.
I hope that helps.
