After chatting with another owner of one of these conversions, I'll re-iterate that these conversions are not new vehicles. While the 4x4 conversion is new and appears durable, a thorough PPI of the rest of the vehicle in line with the mileages they show is certainly warranted.
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'99 EB ex ENG KSWB news van, low rent 4x4 conversion (mostly fixed by now), home built interior.