Wayne, I'm in the garage door buisness and I wanted to let you know you are going to have to take in account that when you add additional weight to your garage door the springing also needs to be changed. The Clopay model 4300 is a great door!! When you add you add additional struts you are adding about 5-10 lbs of extra weight, per strut, depending on the gauge of steel the strut is made with. If you decide to go ahead and install it with the addtional struts you are going to have a hard time balancing the door and you are shorting your spring life. Springs are usually a 10,000 cycle which means 1 cycle is a up and a down. If you have any questions just let me know.
Travis
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