Visit the following site,
http://mfdhousing.com/placement.html#placing for assistance in selecting your MH for Utah. Following is a quote from the above web site.
"Be sure your energy package is designed for the climate zone where your home is located.
What energy-efficiency options are available? The National Manufactured Home Construction and Safety Standards require separate energy efficiency levels for the three different temperature zones of the United States. However, you may wish to increase your home's energy efficiency. There are a variety of optional energy packages available, such as increased insulation, double- and triple-glazed windows, sheathing products, self-storing storm windows, and "high-efficiency" water heaters, furnaces, refrigerators, and air conditioners. Ask your retailer about available energy-saving features and their costs. You especially should note the "heating certificate," which specifies the temperature zone for which the home is designed, and the "comfort cooling certificate," which specifies the appropriate central air conditioning system for the home. Both certificates are located on the inside of the home. You should not place your home in a climate zone for which it was not designed."
In addition to this info, if you own the land, install it on a permanent foundation with vents. This will provide additional stability and cold weather protection. Check on the wind zone for the Utah area to make sure your MH is constructed to meet the wind standards for Utah. The HUD site at
www.hud.gov has a lot of good information on MH.