Well, to start with, I am a lorry driver driving in Europe.  Well, one of the solutions for at least a small inflow of money into the Treasury is foreign trucks. As we all know, most countries have foreign trucks, such as Ukraine, Poland, Bulgaria, Romania and on and on and on.
So instead of customs officers and police officers spending all day (doing nothing clever but trying to harass honest citizens) on Slovenian drivers, it would be much nicer if they would do a little bit on foreign lorry drivers (we are talking about singling out lorries by driving them through the car park and then inspecting them by our state authorities). I am talking about rest areas on motorways, where they could easily do an inspection of foreign lorries and the goods loaded (a job for customs officers). As I have not even noticed Slovenian customs officers on the motorways, I drive on them a lot.
Because some vehicles are not roadworthy, some trucks are carrying stolen goods, not to mention other things. But please do not blame me now for focusing on lorries.
A few years ago, I had an encounter with the Slovenian police, and a friendly policeman stopped me at the Fernetiči border crossing just as I was returning from Italy, where I was fined for a mobile phone that I was not even using. Now the policeman wanted to do a check, and of course I asked him why he does not stop foreign citizens but stops me when I am returning from abroad. The answer was that our policemen cannot speak Romanian, Bugari and all the other languages.
Well, I explained to the friendly policeman that even in France or Spain, when the police stop you, they do not speak to you in your language, but in their own, and that they take the papers of the lorry, the trailer and, of course, the edges, write on a piece of paper how much you owe them for the fine, and then add a telephone number and go on about their business with your papers. When you get the money for the fine, the cops come back and give you the papers back when you've paid the fine. (All official)
So give our lazy policemen and of course customs officers, of which there will be a few more now that Croatia has entered the EU, all the orders and permits to stop and control foreign goods vehicles (trucks, vans, cars) because this is where the money for the state coffers is most easily earned.