A: A cubic foot of dry, loose gravel with 1/4" to 2" stones is 105 pounds per cubic foot. So, a cubic yard is that times 27, or 2835 lb. (There are 27 cubic feet in a cubic yard.)
If iis wet at all I would make two trips. You could end up over weight on trailer, Combined vehicle, and even tire rating depending on what tires are on the trailer. It wouldn't be worth the ticket to me plus it will not cost you that much more to make the two trips and be safe. Just my $.02
I am a concrete contractor. I use yards x 1.5 to equal tons of gravel. also 80 square feet 4" thick is one cubic yard also 27 cubic feet is one cubic yard. I hope this helps.
yards to tons is a loose translation. I got a yard of gravel on one occasion, and it was 2800 or so pounds. The next time there was more dirt, and it was wet, and it was 3300 pounds. My pickup wasn't on the bumpstops, but it was close. I took it easy on the way home.
I am able to haul about 2/3 yard gravel in my 1/2 ton pickup...better to make extra trips and spend a little more in gas than damage your truck or trailer or have a nasty overload accident.
The stuff I hauled was about 1.5 tons to a yard. $10 a ton for 1" minus crush or $5 a ton for pit run. Hauled close to 40 tons in all.
My truck loaded to the bed rails holds ~4000lbs of gravel. I got tired of hand unloading after 3 loads so I hired a friend with Chev C50 with dump body.