Do you remember how it was in CoD 2 (i don't have played part 3-5)?
In the game you have a climb-animation for windows and walls. But you can use it for entering a static Halftruck too.
I think that would be a good animation (for the beginning, better than nothing)
For sure you are a easy target if you leave or enter a vehicle, but that is, how it is in real life too.
Maybe it is possible to take a look arround, above the flanks of the Halftruck, when you sitting inside. And maybe it will be possible to firing some rounds out of the Halftruck, too.
And i hope it will be possible to jump on a tank when you are a poor infantry-man so that you can take a ride
. Because this way is better than the actually option for "tank riding". Because at the moment you only sitting on a tank without any chance to firing your weapon.
But it is possible to sitting on a tank in RO:OST, too. You only have to jump on a building or a wall, the tankdriver have to come near you and you can jump on the back of the tank. But the problem is, it is to complicated and most of the time there is no right object for using as a ladder.
So i wish the boys will do a great job with RO:HoS, and don't forget the marketing, because nobody know RO:OST, and the server are emty, (or full - TWB 50/50 and you can't join it).
But another question, is it sure that there will be any tanks and vehicles in RO.HoS??? I haven't seen any screen of it, or reading a official statment about it.
greetz