if your worried about melting a line, or rubbing through a line, then i say hardlines are the way to go for your set-up.
normally when i set up a customer air ride system, i explain that the car must always be able to roll, steer, and stop. that way IF something does go wrong, you atleast have "some" control in getting the vehicle safely to the side of the road. as for blowing a bag, it wont happen, unless they are installed very wrong, or you run waaaaaaaaaay too much pressure, like double...almost triple what a standard air ride compressor will put out.
now i have a dually that lays the rockers flat on the ground,(do as i say not as i act kinda deal) IF it ever has a problem, yes, i am putting myself and everybody else on the road in danger(just like if a balljoint breaks, or a wheel falls off), but i have 80,000+ miles on it, and have never had ANY problems with it. routine maintance is key, making sure all the parts are in good working condition, replacing air lines just "cuz"...an of coarse this system was designed and set-up for years of trouble free use.
you can "what-if" anything to death, some of the concerns are legit, and there are solutions and options to address the concerns.
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