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Thor Motor Coach 20L Promaster keeps an estimated 55% of its value after 5 years — #2803 of 5706 RVs & trailers VINdown tracks.
Per VINdown's modeling, the Thor Motor Coach 20L Promaster retains an estimated 55% of its value after five years, ranking #2803 of 5706 RVs & trailers we track. That trails the 69% five-year average for Class B in its class by 14 points, so it depreciates faster than most rivals.
Most of the loss lands early: the Thor Motor Coach 20L Promaster sheds about 14% of its value in year one alone. From roughly $126,871 it falls to around $83,377 by year five — a five-year loss near $43,494, about $23.83 a day in depreciation.
Because the steepest drop hits around year 1, a lightly-used Thor Motor Coach 20L Promaster bought at 1 year old lets the first owner absorb the worst of the depreciation while the curve flattens — usually the value sweet spot. Explore the full year-by-year curve, trims, and true cost of ownership in the Model Lab above.
It keeps an estimated 55% of its value after five years — better than most among the 5706 RVs & trailers VINdown tracks (ranked #2803).
From about $126,871 when new it drops to roughly $83,377 after five years — a loss near $43,494 (55% of its value retained).
Around 1 year old: that is just past the steepest depreciation, so you skip the biggest drop while the value curve is flattening.