Thor Motor Coach 20K Promaster vs Thor Motor Coach 20L Promaster: 5-year value retention (55% vs 55%), resale value, and cost of ownership head-to-head. Thor Motor Coach 20L Promaster holds its value better.
On five-year value retention the Thor Motor Coach 20L Promaster comes out ahead, holding about 55% of its value versus 55% for the Thor Motor Coach 20K Promaster. Over the first five years the Thor Motor Coach 20L Promaster loses roughly $67,123 while the Thor Motor Coach 20K Promaster loses about $63,599 — a gap near $-3524.
First-year drop is the biggest factor: the Thor Motor Coach 20L Promaster sheds about 28% in year one versus 15% for the Thor Motor Coach 20K Promaster. If you buy used, the steeper early drop is what the original owner absorbs.
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