In the 1970's the forerunners of the doublewide was the Expando-Room - tip outs and slide outs. These were room extension built at factory, shipped inside home, and tipped or slid into place once home was sited. Tip outs generally are hinged at the floor. Slide outs are like a draw. They slide along the floor out of the home onto the pre-set piers. For a slide out you can use pipe sections place under it to roll it. The tip out is lifted and rotated into place
Pre-set piers on the ground to support the expando. When the homes were new they came with instructions on exactly where to set the piers. Finding a set of old set up instruction will be imposable. Soooo... Take care to figure out where you need to place the piers in the best position to support the weight of the expando. Be sure you do not let the floor of the tip out or slide extend past level with the floor of the rest of the home, or you may very will find your addition in pieces on the ground. Set the piers and then (slowly and gently) move the addition out onto them. Watch where you put your fingers. Depending on the size it may take three or four men to move the expando into place. Take care on not to rack the expando. Move it evenly and smoothly. Do not try to walk or rock it into place.
There is no interior wall, and usually the roof slopes away from home and will have a lower roof line than the main part of the home. Once in place you need to flash and seal the roof and exterior wall. See the free article Sealing an Addition for some tips.
If you have never done this before you would be wise to bring in an experienced, licensed MH installer to guide you thru the process.
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