For more than 30 years, independent companies certified by automakers have converted cargo vans - the big ones that painters and carpet layers and the like use - into rolling apartments with thick carpet, polished wood, mood lighting, TVs, sofa beds, iceboxes, stereos and huge lounge chairs.
(independent companies; certified; by automakers) (independent companies certified by automakers; have converted; cargo vans; T:For more than 30 years)
independent companies independent companies certified by automakers
certified have converted
by automakers
cargo vans T:For more than 30 years