Career mode - Can't use modded cars for deliveries ?

So I really enjoy career mode but something I find really disappointing is that I can't use modded vehicles for deliveries, but I've installed cargo in my car. I can do the deliveries with my vanilla car (pessima) but with my modded vehicles (vertex na2 and etk k series) when I'm in the delivery menu it says "Your vehicle has no containers installed. Head to your garage and install one !". Is that normal or is it a bug? I know career mode is still in early developpment so that wouldn't be surprising. Thanks for your help

 

Nobody can help me? That's really pity that I'm not able to use modded cars, I really like some of them and I'd love to be able to use these for deliveries.
Also I also encounter another bug when making vehicles delivery. Everytime I arrive at destination and deliver the vehicle, it simply disappears but the mission is still active and I don't earn any money.

Thanks to anyone who can help me

 

Hey man, im having this same problem but it lets me install the cargo boxes and drive my mods around like normal but the second you try to load cargo, the game breaks and you cant do anything to the car leaving me to have to get rid of it. Its happened twice with one repo car and another non-repo car. No clue why, just is what it is.