Enter the 1098 data for the second home in the same section where you entered the one for the primary home. Click "add a new 1098" to start a new entry screen. TurboTax will ask you if the mortgage is secured by a primary or second home.
In fact, a mobile home, RV, house trailer, or houseboat that has sleeping, cooking, and toilet facilities counts as a main or second home, and as long as it meets all the other requirements for deducting mortgage interest, you can claim the interest like an immovable home.
Please see this article and this one for more information on home mortgages from TurboTax.
See this article for more information on mortgage interest on a second home.
See IRS Publication 936 for more information on mortgage interest deductions.
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