I have put some 1500 miles on my Dahon Boardwalk. I had to have a custom rear wheel built to do it, though. Popped spokes like that was the idea when I first got it. My LBS built a rear wheel 20 " with 36 spokes for me, and after that and some tire liners I have had very little trouble with it. Replaced the chain recently, but that is normal wear and tear. I am a little lighter now, but topped off over 270 lbs.
goes on the bus and light rail very easily, and then I ride the 10 miles home after work.