The support rods are in each of the tandem mounting kits. There are different height differences for each type of job you want it to do, that they leave it up to the customer to bring their own rods and lock nuts. On the chart are support guide diameters and how you should mount it. If your trailing pump/pumps go over 65lbs you will need support rods. You will need to put them on the bottom of the rod that goes to the same mounting area as the electric motor and pump flange bracket.
If you need further help with this unit, call us at 662-871-8403 or 800-361-0068