Is this to thick of steel?

[abadsvt]

I have gone back and forth deciding on what route to go with my truck frame. I finally decided and bought some 20' sticks fo 2x4 3/16 tube steel. I started cutting up the steel for the back half and i realized how heavy 3/16 tube steel is. I had plans to use 3/16 throughout the entire frame but after seeing it in person i am wondering if i should have done 1/8 tube steel instead. Do you think i should stay with the 3/16 or go with 1/8 for the frame? I am just worried about overall weight when i am done. Thanks Josh