Authentic Saints van. Because if you're going to hit that Syndicate bank, you have to do it with style.
Installation:
Drop it into mod_overrides.
Known issues:
Because there's only one texture for van side, 'St' letters are backwards on the right side.
Maybe I will replace them with something else in upcoming version.
Updates: 15-10-2015 - Okay, after first day of ShiCrimefest 2015 I've lost all interest in Payday, and I do not think that I will be updating this.