DM800 For me too! Also the Autocar Trucks. Be nice to have the Log Trailer back too. And, While not strictly a truck, the Cat D9 Dozer too. Correct the blank front grille, or offer a PE grille in the kit.  If I'm dreaming big, the Dozer, the Lowboy trailer, and either the DM800 or the Autocar as the prime mover. Not all in one box, but tied together with a couple choices of decals for all three. Use one large-ish decal sheet, and put it in all three of the kits. Have markings for all three units on the sheet. And since we're wishing, how about a Modern, Oval Tank Trailer.