Allison XB 21 Bassport Pro Elite DL vs SeaArk 1660MVT: 5-year value retention (68% vs 68%), resale value, and cost of ownership head-to-head. Allison XB 21 Bassport Pro Elite DL holds its value better.
On five-year value retention the Allison XB 21 Bassport Pro Elite DL comes out ahead, holding about 68% of its value versus 68% for the SeaArk 1660MVT. Over the first five years the Allison XB 21 Bassport Pro Elite DL loses roughly $25,520 while the SeaArk 1660MVT loses about $2,433 — a gap near $-23087.
First-year drop is the biggest factor: the Allison XB 21 Bassport Pro Elite DL sheds about 10% in year one versus 15% for the SeaArk 1660MVT. If you buy used, the steeper early drop is what the original owner absorbs.
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