My 2018 Thor Siesta built on a Mercedes Benz Sprinter chassis did not come with a spare. I bought a rim from a company in Oklahoma (M/B knock off) for $47.00 including shipping to California and a Curt hitch mount spare tire holder. did have to relocate the rear license plate with an led license plate holder from etrailer. I bought the matching tire had had it mounted and balanced. In total around $350.00 plus some time to plug in the license plate holder to the trailer hitch plug and a couple of zip ties.
Paul
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