I had a Lance 835 and loved it.
I installed a Wave 3 cat heater behind the stove and plumbed it into the propane system. I'll tell you the routing if interested. Worked great and just sipped propane.
I also found that a group 31 battery would fit into the stock battery compartment.
A Honda eu2000 generator also fits nicely in the space under and in front of the fridge with a towel around it to protect the wall.
Enjoy the canyon. I used to live in Tusayan (near the South Rim)and never tired of exploring the area. First snow is usually mid November.
-Bill-