Full black water tank

I have worked the "honey wagon" in the past and it's not a job I would want ever again. There was a time or two we had to go in the RV and pull through the toilet do to blockages but we used a smaller dia hose and always reduced the vacuum pressure. Using the bucket method was standard procedure for the outside and you'd be suprised how many people are getting no benefit from their vitamins. I even had a helpful owner hit the electric valve switch for his black tank before we were ready and I had to burn the pants and shirt I had on.