It will be good if some good mobile ready war vehicles 3d models will get available on market place, things like 4 wheeled vehicles with guns and rocket launchers attached.
Sounds rather specific, I doubt anyone is going to make exactly that tbh… Maybe you will have more luck if you check into hiring someone as a freelancer? https://forums.unrealengine.com/forumdisplay.php?25-Got-Skills-Looking-for-Talent