Looking at upgrading from my 94 Burb to a 2000-2003. Pretty much anything in my price range will have high miles. Taking the general condition into account, how many miles is something to worry about? Do these still have the same tranny issues if towing heavy loads? My 94 is in excellent shape, rust free, relatively low miles for it's age (157k), and has a freshly rebuilt tranny with cooler. I pull a 6000-6500lb travel trailer. I don't want to end up having regrets just because I was looking for a better ride or more modern looks.