If you're looking for the most reliable wheelchair vans and wheelchair lifts, BraunAbility is the brand to look at. Their products are more reliable than anything else on the market. Plus, Ralph Braun, the owner, is a wheelchair user himself and created the company based on his own need. I feel better knowing my products come from someone who understands the needs of someone with a disability.
Braun converts minivans with fold-out or in-floor ramps and will do an after-market conversion on a van with less than 30,000 miles. As far as lifts go, they're usually just installed on full-sized vans.