Before, thinking about how to dress your food truck, you need to consider the kind of logo your food truck will have. You need to use colors that match your brand and fonts that are readable from a distance.
Likewise, the color that you pick should be chosen wisely. It will depend on what you want to transmit to your customer. If you pick warm color, your track will give an outgoing, energetic vibe. Or if you pick cool colors, it will give an upscale, trustworthy, calm vibe. It all depends on what you choose.