A "1988 Coach" might be on a 1987 or 1988 Chassis. In any event, if the Chassis is Ford, I believe the wheels had gone to 16" by 1987. Probably earlier. Our 1984, mentioned above, was on a 1983 Ford E350, and it had 16.5-inch "Coined" wheels that were difficult to find 16-inch replacements for. Starting 1984, E-Series had "hub piloted" wheels that interchange with the newest models. So, I don't think wheels will require replacement. But even if they did, used 16-inch wheels are available. Might even be able to get some with new tires mounted, from a 4x4 conversion outfit like Northwest QuadVan in Portland or Quigley in Pennsylvania.
