Heavy Rider (300lb+) - Please recommend a 26" tyre to avoid tyre pinch I ride a hybrid on 26" rims currently fitted with hybrid tires.  As I am 300lbs+ the rear tire runs permanently deformed/flat and the rims ride over the rubber causing tire pinch.  Can anyone recommend the tyre tube combination that I should try to obtain that will stop this happening?
As a heavy rider personally, I don't have many issues with flats. 

A normal tire on the high/maximum pressure works fine to avoid pinch flats. 

The key is to check tire pressure every time you get on the bike. Even a day will allow a tire to soften 10 psi, and that will allow flats to occur. 

Road hazard flats are not avoidable except by avoiding the hazard in the first place. :)

Edit: to be clear, my answer is that it is most likely that your existing tires are not fully inflated, rather than that a different tire is needed.