Yeah I'd just check them and reuse them if cost/time is a concern. My truck is around 250,000 miles and it's been on it's third set of bearings for about 10,000 of them. If you want peace of mind, though, there's nothing wrong with replacing them.
I was reading the rock auto news letter yesterday and there was a customer story about a guy who bought a ford truck cheap because the back brakes locked up unusually under normal conditions. He replaced the shoes and didn't know they were on backwards so he put them on backwards AGAIN copying the old brake job. When they locked up after the brake job he just adjusted them out so that they wouldn't do it any longer. Took 3 years later at a vehicle inspection for someone to notice it. Long story, but yeah, thicker pads to the back.