slide roller repllacement

We had a roller pop out of its brackets on our heavy slide, which contains the big 4 door fridge, oven, microwave and entertainment center. It did no damage and couldn't figure out how it happened. As Vulcaneer suggested we stacked up some long 2 x 10's that were laying around and then set our jack on them. We used a long 2 x 4 under the slide to spread out the weight. We jacked up the slide maybe 3/8" and were able to push the roller back in. One side of the roller retracts a little and it was very easy. We didn't think of taking air out of the tires.