How many 3x3x8 bales will fit on a 48' flatbed semi trailer?

Let's do the math first. One 3x3x8 (obviously large square bale) is equivalent to 72 cubic feet. The length of the trailer would be 48 ft., width would probably be around 8 feet since it's that attached to a semi truck (the number is estimated though, you'll have to measure the width yourself), and bales would be probably be stacked around 9 feet high. That is 48 x 8 x 9 feet = 3456 cubic feet.

To find the number of bales that can be fit on the trailer, divide the trailer dimensions by the large square bale dimensions: 3456/72 = 48 bales. Thus, 48 large square bales (plus or minus, depending on how high you want to stack them) would fit on a 48 ft flat-bed semi-trailer.