Not to offend any one here, but you don't need a fancy cart to move your gear. A bucket will work to carry your mags; ammo and little extras you might have. If the bucket has a lid you can even sit on it.
kraigwy is correct in his answer. Old school is tried and true.
I have a shooting buddy I went to Perry with in 07. His range cart more than likey weighed 300 pounds. He had something in his cart for about anything that could happen on the line. If you needed a 9/16" wrench he more then likey had it someplace in his cart. I might be a little extreme here but it seems to be the trend this days to have a massive range cart. I've walked my gear most of my life as a shooter. I have the same shooters stool I got when I first started. I wore out one stool bag and got another but the frame is the same.
God Bless our Troops especially our Snipers.