I bought an old 90 E350 from uhaul for like $3500, told them I lost the bill of sale, thinking it wasnt valued at much at all and they would give me book value, well they asessed it at about $7500. Needless to say I was able to find the bill of sale shortly afterwards.

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1996 E300 D
1992 300D
1990 Ford E-350 7.3 Diesel AKA "the Deep Fryer"