Considering what moves through that hose each time you dump I'd say springing for a new one would be your best bet. Since it has one small leak others are sure to follow - and they'll grow in size!
Try not to drag the hose along on concrete when dumping. Concrete chews up that material. Think about when you pull that lever for your black water and that hose shifts around when it fills up - if it's laying on concrete doing that it's not good for it.
That movie 'RV' was hilarious! :B