I just turned a little over 5000 miles on my truck while having the RCBS Chargemaster on my console and she still dumps powder charges accurate enough to swear by. And much of the time, I was not going down very nice roads. I have jiggled it enough that it has even fallen off the console a couple times and I thought for sure the scale would be screwed up from then on but it was fine.
Last week, I attended a BR match and left a day early to do some moose scouting on the way and ended up on a road that was barely fit for ATV's and it seemed that full sized trucks were never intended to travel. To make a long story short, it took me 5 hours to go 12 miles on this road and it dang near shook the camper shell off my truck! The Chargemaster took several good beatings on this road including having my optics case bounce off the rear seat and land on it! I thought for sure that I was going to be screwed at the BR match because my powder dispenser would start spitting out bad charges from a broken scale but it never even missed a beat! It even loaded ammo accurate enough for me to shoot this 10 shot, 200 yard range record the next day: