Hi Steve, we too got a new 2720 but ours is a 2006 model. We purchased a flat screen LCD tv and use the antenna, in fact we did not crank up the antenna the first few times because our reception was good. We were about 30 miles from the closest TV tower, I was wondering if you were too far out for any signal or since your leak is in that area maybe something pulled loose?
There is just the DW and I that usually camp so we have plenty of room. Occasionally the GK's come for a few days and it can get crowded so we use the picnic table outside as much as possible. As for the sanitary plumbing you may want to get a heaver gauage sewer hose. I had the one supplied by our dealer break three times. Something you really don't want to experience!
Have a great time camping and consider we have problems even with our homes as well so problems with a trailer, motor home, 5th wheel, etc is always going to develope just give it time!
Midwest Dave
Where the Mississippi River runs west!