They come in 3 weights.
Thick wall concrete
Thin wall concrete
and cinder block.
And the actual weight can vary from mfg to mfg. Even from batch to batch.
Call you brick yard and ask.
Assuming you will be buying a bunch, it would pay to find out how much HD would charge for delivery and then cost out each of your round trips, the value of your time, and the additional wear on your vehicle. The delivery charge may be a bargan.
Paying the $19.95 rental on Home Depots truck might be cheaper than breaking yours. Our local Home Depot has an F450 with a flat bed that they rent to customers on an hourly basis. Maybe yours has the same deal. Good luck.
Also if they are wet or dry... Take a bathroom scale and a calculator with you. Stack up enough to load the scale to 100 lbs to get a good reading. Load them as far forward in the bed.
I just hauled 60 in my 2500HD Chev and that set truck down. I only when about 10 miles on good roads. HomeD did not want to put that many on their truck.
A standard pallet of medium weight and standard weight 8x8x16 hollow wall blocks is 90 pieces, and is in the 2200- 2800lb range.
We haul these all the time. Typically 3-4 pallets on our small trucks, and up to 18 pallets on our tractor-trailer. All of them 'self-loaders' being knuckle boom trucks or the tractor trailer with a moffet (tow behind forklift).
Here is one of my drivers delivering my wall blocks