I bought something similar to work on the tractor but my gut told me to buy 6 ton jack stands as well. Get it up with the ramps and then brace with the jack stands.
I built a set like this after the steel ones my brother had collapsed when I closed the pickup door. The wooden ones are really heavy and cumbersome but I never worry about them collapsing. They also work really well for the peterbilts when changing clutches and the such.Mine were pretty heavy to move around, but I bought 2 x 10 lumber and made solid ramps. The bottom board was cut 4' long, cut on a 45 degree angle on one end. Each succeeding board was 6" shorter, so it was 4', 3.5', 3', 2.5', 2', 1.5", all with the 45 degree angle, and each attached to the one below with four 3" countersunk wood screws. On the square end, I attached an upright board as a stop. The first time I made a set like that was to park a little motorhome on a sloped driveway so it would be level when parked. Years later, I made a set to use in my shop building to get under the car and pickup for such things as oil & filter changes.
Of course, the solid wood ramps are heavy, but I attached a metal "handle" (drawer pull type, but large) on one side of each of mine. I tried to figure out about where the balance was, so I could pick up both of them, one in each hand, to carry them to where they were needed.