So your issue is that you are not going to be able to pull it to the TV to hitch it up when full? That would be about 350 lbs. I'm not a weakling, but I would not want to try that. You could either keep it or send it back for a smaller one if you will realize significant savings and don't have to pay return shipping fees. Your gray water most likely will need to be emptied, but if your black tank is 42 gallons, you should be able to go for more than a week before filling it up - depending on the number of people I guess. And I don't bring mine if I'm going to a full hookup site.
