Isata 30FWD4X4 RAM 5500 vs Thor Motor Coach 20J Promaster: 5-year value retention (62% vs 64%), resale value, and cost of ownership head-to-head. Thor Motor Coach 20J Promaster holds its value better.
On five-year value retention the Thor Motor Coach 20J Promaster comes out ahead, holding about 64% of its value versus 62% for the Isata 30FWD4X4 RAM 5500. Over the first five years the Thor Motor Coach 20J Promaster loses roughly $55,928 while the Isata 30FWD4X4 RAM 5500 loses about $108,206 — a gap near $52,278.
First-year drop is the biggest factor: the Thor Motor Coach 20J Promaster sheds about 28% in year one versus 26% for the Isata 30FWD4X4 RAM 5500. If you buy used, the steeper early drop is what the original owner absorbs.
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