In the final thesis we presented the key factors which must be considered in the design of drinking water tank vehicles. We focused on the upgrade of the drinking water tank vehicle type PRE 04, produced by a Slovenian company. Our aim was to research factors which could potentially be harmful during the transport of drinking water. We examined whether stainless steel AISI 304, which comes into contact with drinking water is suitable for the design of such vehicles. We have found that when designing such a vehicle, in addition to the correct selection of material, different regulations and approaches to design must be considered. The analysis of the results of drinking water confirmed the suitability of the mentioned material for use in the structure of water tank vehicles for transporting drinking water.