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All Triumph dealers have demo bikes. None have every model available, but usually a couple. I know Performance Cycles of Shrewsbury MA has (or had) an Explorer 1200 XC recently.
You could call around to ask which demo bikes each may have. In general terms, they will usually have demo bikes in models that sell. These days, the Thunderbird 1700 cruiser, the Bonneville and perhaps one of the variants of the Tiger/Explorer.