I also grew up in Warren Mi and still work in that area and I think there is a big enclosed car hauling trailer with the "Color Me Gone" words painted on its sides sitting on the south side of 13 mile rd around the Halmich Park area. I rode my bike between 11 and 13mile rds and between mound and dequinder..so right in your area.
Could this be your co workers place or the house that you remember when growing up? I have never seen a car parked outside but have always been curious when seeing the trailer.
Thanks, Garry.