I have been travelling arond France, italy and the Balkans with my old giant Volvo for the last 2 months.
I prefer to stay in a campsite when it is affordable cos I am a girl travelling alone and dont want to offer an easy target.
When its not affordable ie Italy, France with no camping communal in the vicinity..
I find a spot with not too much foot traffic, ie not outside a bar and other parked vehicles. Service station parking, residential area whatever where there are other vehicles parked.
Noone has ever bothered me, but I aim to be low key, leave again in the morning, car looks clean no weird paint job etc
A van or factory tint windows is great, I had this on all my road trip vehicles in north america and NZ
in a rural isolated area I feel I stand out as the only parked vehicle, foreign plates and the news is all over the district in 10 min!!
France camping communal only a few euros
Serbia camping or cobe (room) only a few euros and they sometimes throw in breakfast, look on the site for mini campings
Montenegro camping 5 euro
Albania seems more like 10 euros and not many camping sites
Good thing about a campsite is you are paying for safe parking while you go and look at the local town/historical/national park and no worries about your gear in your car.
you can cook your own food and buy it in advance somewhere cheep so it costs me 5euro/day for all my food.
I've been staking in truck stops in Italië for the last few days, iets fine there is always a few other people overnight in the car area plus a lot of trucks in the truck area.
The autogrill ones are open 24h and often have a free shower
Have fun!!