An adjustable all-terrain dolly system having a chassis assembly that includes a frame which has a right-side rail, a left-side rail, a first-adjustable cross member and a second-adjustable cross member, and a first-rolling assembly to include a first-set of inline wheels and second-rolling assembly to include a second-set of inline wheels and at least one adjustable-locking mechanism. The adjustable all-terrain dolly system is configured to transport a load over a surface.