OxygeNGaming

Like one of the rules said already, no more than game allows. Which I believe 8 small ones and 1 large beacon. Or 12 small beacons and 0 large beacons.

§3.1 - Truck modding -> It is not allowed to place more items than allowed by default by the game (beacons, lights, horns or any other item). -> It is not allowed to place beacons and large horns on bullbars/bumpers/sun visors. Normal beacons are allowed only on the roof and on the roof bars. LED beacons are permitted where allowed by default, while normal LED lights can also be placed on bullbars and roof bars. -> Items meant for trucks' interiors cannot be placed outside the truck and vice-versa: as an example, it is not allowed to place beacons inside the cabin or place wheel knobs on bullbars, this is valid for every other item.

You maybe could go to LGS and set the turning radius of 900 degrees there and see if it works.