I just got a Pride Go-Go Elite as a holiday present (to myself). I am going to be a powerchair user soon and we didn't want to screw with insurance. I got mine off ebay, with 1 year service agreement. Good thing too as it needed service (turns out the brushes on the go-gos are not good quality and all it needed was oil, but the lous noise is already starting back). Otherwise its great I can get it out of my SUV with no assistance, getting it in is and issue because of my balance problems. Do you mean heavy duty as in durable or for use because one is overweight? I thnk the Go-Go can hold up to 160lbs. I had a Revo 4 wheel which was great but a pain in the rear to transport, so I sold it. I think my revo could hold 250-300lbs.