Yes. You can deduct interest you pay on a loan secured by your main home (where you ordinarily live most of the time) and a second home. A mobile home, house trailer, recreational vehicle, or houseboat that has sleeping, cooking and toilet facilities can be a main or second home. It will still need to meet all the requirements for deducting mortgage interest.
Even if you don’t have a 1098, you’ll still need to enter the requested information from an alternate source, such as your mortgage lender or year-end mortgage statement. In that case, just enter everything when prompted as though you have a 1098. (Because you’ll be entering the equivalent of the amounts from the different numbered boxes of the 1098 without actually having that form).