I need help with rear car weight for odering coilover springs from strange engineering

[LsxBuickRegal1982]

I have some coilovers from my uncle and in order to order news coils for my 82 buick regal strange told me I would need to weigh the rear of my vehicle but I don't have access to a scale anybody got any clue

 

[bracketchev1221]

What coils are on there now? My Chevelle was just around 3200 lbs with me in it and I used 138 lbs Hypercoils on them.

 

[LsxBuickRegal1982]

Not sure I can get the part number off the coils when I get home