Sometimes you want be in a tank with a friend who you can rely on. Usually on pubby games there is not much coop going on in the tank, so you get killed quickly and it's frustrating. Unfortunately when the match starts for example on arad you have to look for each other while everyone gets to the tanks and drive away and even that sometimes doesn't work out. So you select your friend and if he does the same you respawn in the same tank(you could also pick up roles like if you want to be a driver you won't respawn as a gunner) Most of the people would like to respawn into "best tanks" so there should be some random system so sometimes if you lucky enough you respawn in a Tiger but most of the time you will get a standard tank like T34 or PZ. In RO 2 there gonna be just 2 tanks from the start of the game, however am quite sure later on we will get more tanks and some tank battle maps like arad, ogledow or blackdayjuly.
