You don't mean the hose from the rad cap to the coolant reserve bottle, do ya ??
Mine is one "one ˝" hose, not a combo and is is still supple and in good shape !!
Did you buy the JKU "used" or new and maybe it's either the type of antifreeze thats been used, or the environment you live in (heh heh, can't change that) !
Ask the service manager if this is common in your area !!