(sorry for the delay; pensionfren came over for the day's driving practice sess)

 >>/934776/
I'm planning to travel like with the postie, only taking as much as I can carry in a backpack (roughly), but I do want a car fridge so food and milk doesn't spoil after a day during the summer. An ice maker would be awesome too. Other vancampers I've chatted with have done that on a 100Ah Lithium battery with solar charging. The van's starter battery is "95 Ah", which for AGMs really only means 50 Ah. A second batt means not risking the first one. 

 >>/934777/
Yeah, seen all those, but they're for cars with factory roof rails.
An option is to poprivet aftermarket tracks. Those prices are antiNEET.     

 >>/934782/
No rails, have to find a compatible gutter-mount solution. The roof's certified dynamic capacity is just 80kg too.   

 >>/934783/
Postie fits inside! \o/