rugged portable cart to haul equipment around

So we have destroyed half of a dozen of these carts:

https://www.harborfreight.com/24-in-x-36-in-folding-platform-truck-68894.html

hauling around all our equipment. Anyone using a better option? Like you would hurt that person that takes your cart aka My Precious!

We usually haul around 1U switches that go over asphalt and bumpy sidewalks before getting to the nice flat floors in buildings. The carts have ended up with handles coming off due to the nuts vibrating loose (fixed those with nyloc nuts), the wheels get chewed up, and the whole frame eventually bending too much to be good anymore.