Isata 34DSD4X4 RAM 5500 vs Thor Motor Coach 18G Promaster: 5-year value retention (59% vs 59%), resale value, and cost of ownership head-to-head. Isata 34DSD4X4 RAM 5500 holds its value better.
On five-year value retention the Isata 34DSD4X4 RAM 5500 comes out ahead, holding about 59% of its value versus 59% for the Thor Motor Coach 18G Promaster. Over the first five years the Isata 34DSD4X4 RAM 5500 loses roughly $127,743 while the Thor Motor Coach 18G Promaster loses about $55,527 — a gap near $-72216.
First-year drop is the biggest factor: the Isata 34DSD4X4 RAM 5500 sheds about 26% in year one versus 28% for the Thor Motor Coach 18G Promaster. If you buy used, the steeper early drop is what the original owner absorbs.
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