## 4 Results and Discussion
### Measurement Results with SUV
The difference between the empty and loaded vehicles in the division of mass into the front and rear axles of SUV was the highest (13.24%) when the load was placed in the luggage compartment and on the lowered rear seats, and into the roof box. Reducing the axle load by 13% on a surface with a low friction coefficient may weaken the vehicle's ability to accelerate or bend by approximately the same percentage [92; 93]. Kia Ceed and SUV have a relatively short rear overhang. If the measurements were performed with \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Variant** & **Measured Vehicle Mass** & **Theoretical Vehicle Mass (kg)** & **Deviation** (\%)** \\ Load in the roof box only, 72 kg & 1565.5 & 1565.5 & 0.00 \\ Load in the luggage compartment, & & & & \\ on the lowered rear seats, 400 kg, & & & & \\ on the floor in front of the lowered rear seats, and on the floor in front & 1969.0 & 1965.5 & +0.18 \\ \multicolumn{4}{c}{of the front seat, 72.5 kg} \\ Load in the load compartment, & & & \\ the lowered rear seats, 400 kg and & 1971.5 & 1965.5 & +0.31 \\ \multicolumn{4}{c}{in the roof box, 72.5 kg} \\ Load on the floor, 72.5 kg & 1165.5 & 1565.5 & 0.00 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Measured deviations with SUV. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Variant** & **Front Axle** & **Rear Axle** & **Change (\%)** & **L1 (m)** & **L2 (m)** & **Change (m)** \\ \hline Empty vehicle & 61.02 & 38.98 & 0.00 & 1.03 & 1.61 & 0.00 \\ Load in the roof box only, 72 kg & 59.21 & 40.79 & 1.81 & 1.08 & 1.56 & 0.05 \\ Load in the luggage compartment, & & & & & & \\ rear seats, 400 kg, on the floor & & & & & & \\ in front of the lowered rear & 48.63 & 51.37 & 12.39 & 1.36 & 1.28 & 0.33 \\ seats, and on the floor in front & & & & & & \\ of the front seat, 72.5 kg & & & & & \\ Load in the load compartment, & & & & & & \\ on the lowered rear seats, & 47.78 & 52.22 & 13.24 & 1.38 & 1.26 & 0.35 \\
400 kg, and in the roof box, & & & & & & \\ \multicolumn{4}{c}{Lood on the floor, 72.5 kg} \\ Load on the floor, & & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 9: Division of vehicle mass into the front and rear axles of SUV and the distance of the center of gravity from the axles. vehicles with a longer overhang, such as in estate cars, the reduction of load of the front axle when the load is in the luggage compartment would have been substantially higher, and it would have led to the overload of the rear axle. Thus, when modeling, it is necessary to take into consideration the real load distribution and its following real axle load as well as the center of gravity's position in the horizontal plane. The impact of cargo distribution on the center of gravity's position shall be taken into consideration also when modeling the performance division for each axle, as also mentioned in publication [94], since the load of each axle together with the following traction force is changing due to cargo distribution (Table 9), and considering only the weight distribution in the empty vehicle would lead to miscalculations. It is similar when proposing the adaptive suspension in publication [95] since different cargo distribution changes the suspension characteristics. Concerning the vehicle with a load of 425.5 kg, its load capacity was used up to 86%. The center of gravity was shifted up to 0.35 m towards the rear axle, as follows from Table 9. A different distribution of the load led to changes in the axle load and in the center of gravity's position (Tables 5 and 9). The changes due to different cargo distribution in Tables 5 and 9 are logical, i.e., there was not any shift of the center of gravity towards the front axle and vice versa when moving the cargo into the rear part of the vehicle. Thus, it can be assumed that the weighing of the vehicles and the following calculations were correct and correspond to the current state. Therefore, the data from Tables 5 and 9 are applicable for further modeling and comparing as well.