Exterior Insulation

Going to be living in a double wide for long time soon. This spot is on water so if we built a house the taxes would be too much for what were trying to do financially.
The windows and roof need to be replaced soon. Thinking ahead does it pay to add exterior insulation to a double wide? I grew up in one until middle school and im sure things have come alot farther for making these more efficient. This model is about 15 years old. This is in Wisconsin.
Also if you have any tips on how we can better insulate the floor area that would be great.
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Replies
Will you be living full time in the trailer?
How many years will living in the trailer?
Seems to me the trailer is a short term win but in the long run building the house is the smart move. Every year the resale value of the trailer goes down and every year the resale value of the home goes up. Yes, the taxes on the house are more but it is still a better deal.
If the existing siding and windows are serviceable and the windows are not made of aluminum there is zero chance of recovering the replacement costs. With aluminum windows the ROI seems likely to be over 7 years.
Walta