Find Euro Truck Simulator 2’s document folder on Mac

ETS 2 has a file contains info about levels. Here is fragment of that file:

#   Level names "level_limit|level name" 
# 
level_names[]: "0|@@lvl_name0@@|0xFFe0e0e0" 
level_names[]: "5|@@lvl_name1@@|0xFF45c294" 
level_names[]: "10|@@lvl_name2@@|0xFF75baea" 
level_names[]: "15|@@lvl_name3@@|0xFF3a88f4" 
level_names[]: "20|@@lvl_name4@@|0xFF5847f0" 
level_names[]: "25|@@lvl_name5@@|0xFFda9356" 
level_names[]: "30|@@lvl_name6@@|0xFFf58493" 
level_names[]: "40|@@lvl_name7@@|0xFFc99ef2" 
level_names[]: "50|@@lvl_name8@@|0xFFc2f9ff" 

# 
#   experience points to the next level 
# 
level_xp[0]: 200 
level_xp[1]: 500 
level_xp[2]: 700 
level_xp[3]: 900 
level_xp[4]: 1000 
level_xp[5]: 1100 

It is easy to conclude that after level 50 your name of rank will stay the same. And the maximum level, according this long file, is 150 (but I can't say for sure if any new patch changed that, it's confirmed after patch 1.2.5).

It should be in C:\Program Files (x86)\Euro Truck Simulator 2\base.scs (when you have default installation folder in Windows 7). Maybe you have hidden that file. Here is nice tutorial showing where is the file: