The signs on my trucks were designed/produced/installed by Steve Smith in Sedalia, MO.  He is very, very talented as an artist and will produce various ideas for you to chose from if you prefer.  I highly recommend giving him a try since you aren't far from there.  I have his contact info listed here for you.

Steve Smith
Smith Signs
820 East 3rd Street
Sedalia, MO  65301
(660) 826-6830

I first used Steve in 1992 and he has lettered several trucks for me over the years.  He has always done it right.  I know of others that have been pleased with his work, too.