A 1976 Chevy K10 truck is a 4 wheel drive truck because the K stands for 4 wheel drive and the number 10 in the K 10 means it's a 1/2 ton pickup.
The weight of the 1976 Chevy K10 truck which is a 1/2 ton 4 wheel drive truck is around 4,500 lbs which is a little over 2 tons in weight.
A Chevy C10 looks a bit lighter in weight but the last time I took a 1976 Chevy K10 pickup to the scrap yard to sell for scrap the scale weight was 4,500 lbs.
Of course if you added any mods or a heavier truck bed etc then the weigh can be different.
But your Chevy K 10 pickup should weigh at least 4,500 lbs.
Larger trucks may weigh as much as 5,000 lbs.