I specialize in fire apparatus lettering, but I work on many other emergency vehicles and big trucks. There has been some great advice posted already, and I definitely agree with what was said as far as using only the best materials and taking your time to do good design work. Some may disagree with me, but in my opinion there is a right way and a wrong way to letter and stripe a fire truck. It is an art that goes back to the beginnings of firefighting, when bucket brigades would decorate their fire buckets to make them unique. It was, and still is a pride and ownership thing. The art work continued to get better and better up through the hand pumpers and steam fire engines and then on into the early days of motorized apparatus. But then somewhere along the line, we started to lose track of that pride that used to go into decorating firefighting equipment. It has become the norm (at lest in my area) to tell the fire department they are getting real gold leaf, grab a roll of Sign Gold, choose one of several stock computer fonts (copperplate), cut it out and then layer it on top of some black intermediate vinyl. Now, don't get me wrong... if used properly, materials like Sign Gold aren't that bad. But there is nothing that looks as good as genuine 23 kt. hand laid gold leaf. Materials are only a small part of the equation though, good design work is even more important. There are specific fire apparatus fonts, certain scrolls that were commonly used by certain manufacturers, "standard" striping widths, murals, scrambles... etc. I have spent more time researching fire apparatus lettering and striping over the past few years than I have actually making graphics, but that just comes with the territory. Sorry to get long winded, but good quality fire truck work is something I'm very passionate about! If there is anything I can help you with feel free to send me a message.