The carriage of food products, in particular fresh products, is particularly sensitive to transport conditions. The aim of this paper is to examine the effect of trailer conditions on the quality of refrigerated food transport services. Six wireless measuring devices installed permanently in 3 trailers were used for the analysis. The built-in transmitter sensors have enabled the collection of data in the areas of temperature, humidity, pressure, shock and light intensity. Monitoring parameters via a wireless device can contribute to the reduction of fuel costs in the enterprise, e.g., detection with vibration sensor / acceleration of aggressive driving style of the driver causing suspended fuel consumption, detection of inappropriate transport conditions, etc. Analysis of the test results showed that in the same trailer the product distribution is very important owing to the different temperature. The analysis carried out showed that in the middle of the semitrailer, i.e. in the place where the breeze is located, temperature fluctuations amount to 5°C, which indicates a greater risk of loss of quality of the transported products.