Another dish is not going to do any good, he needs a Duo (dual) node. That is the ONLY way its going to work in that install.
You create other problems when you start doing mad scientist schemes with say 2 solo nodes for a 2 hopper system. The only people who should be doing that is someone who is self installing and willing to waste their own time experimenting. A good installer won't get involved with that mess.Actually another dish would work. 2 1000.2 dishes with 2 lines each to 2 solo nodes. Or one dish and 2 44 switches and 2 solo nodes. Obviously the dual node would be infinitely better as the systems would be essentially seperate and joeys couldn't be switched from hopper to hopper...oh, and you wouldn't have 2 dishes on your house
You create other problems when you start doing mad scientist schemes with say 2 solo nodes for a 2 hopper system. The only people who should be doing that is someone who is self installing and willing to waste their own time experimenting. A good installer won't get involved with that mess.