Tandem riders regularly over pressurise their tyres with no problems. And I don't just mean the road tandems either. We still get punctures but caused by some other means. Obviously at Higher pressures than recomended a tube can split or rip if a puncture does occur but that has not been the case with me. Snakebites are still my main cause- OR- badly fitting tubes in the first place.

But have to admit that the proper tyre for the use it is given is still the best bet.