Hi guys, I`ve had the CPP 5-inch drop springs in the rear of my `64 fleet side for quite a while now, I`ve just installed a rear frame tank which now adds another 130 lbs in the rear, now knowing that I was limited on the weight capacity as it was I now want to correct it , looking the RSC603 HD springs 4-inch drop would these allow me carry more weight in the bed as I still use it as a truck...your opinion would be appreciated.