Here is a tip that makes setting your fiver hitching height very easy. After disconnecting adjust the length of your brake cable so it just touches the ground. I used some small stainless chain with a brass snap connector on the end. Then when your ready to hitch up drop your cable down set your height and back in. Works every time very smooth.
Even better is I took a small bubble level, glued a magnet on the back of it and have it stuck to the steel inside the propane compartment on the side of the fiver. After I unhook I move the whole level until it shows centered, then continue with the rest of my setup. When hitching back up I just need to raise the legs until the level is centered again and I know I am at the right height.