Pics attached. Dimensions are metric sorry. Outer tube is 400mm long, inner 420mm long. The adjustment holes on the outer are 40mm apart with one on the face at 90deg in the middle of this. This allows 20mm adjustment on height. The adjustment holes on the inner leg are at 30mm spacing so essentially there's 10mm adjustment depending on which hole combination you choose. I also use a couple of pieces of ply to put under the foot to aid adjustment as required and make the footprint bigger. To deploy I wind the jockey wheel to raise the rear end, put the legs down as needed, then wind the front of the trailer up to lock it all in.
Outer leg tube is 35mm, inner is 30mm, and trailer support is 40mm. Just increase the length of the tubes as needed depending on how tall your trailer is.