Hello Jeff and thank you for your question.
The GE 40 Gal. Tall 6 Year 32,000 BTU Liquid Propane Gas Water Heater is NOT approved for use in mobile homes. The Use and Care Manual has a WARNING that this water heater is not suitable for use in manufactured (mobile) homes: http://www.homedepot.com/catalog/pd...
You will need to install a water heater that is specifically designed for use in a manufactured home since it requires side water connections. The Plumbing Department or Pro Desk at your local Home Depot store can help you select the correct water heater. They can also advise you of any local requirements and installation options available in your area.
Best wishes on your project.