I have a DW1231 on a Isuzu NPR Cabover truck to do next week and haven't looked at one before. Any tips out there?  Chris

Pretty straight-forward install. You will need a new molding, or you can use 1630 FlexiTrim. Have done them solo, but it's much easier with a helper when setting.  top tech Central CA

Remove lower corner moldings and the lower strip and w\s will cut out with just a cold knife...use flexi-trim wide, as it will cover the old dirt marks. Use cups and set from the middle. FXS