Some players can't see streamed vehicles

vehicles
help

#1

Now I know its caused by the player not having loaded the vehicles, but I’m also not sure how to force them to load the custom vehicles. I need this because alot of new players are unable to roleplay with other players due to not being able to see them. whether it be police or civilians, they can’t be seen by people who haven’t spawned the vehicles themselves. Is there a way to maybe do something like

RequestVehicleModel("contender")
while not hasVehicleLoaded("contender") do
    Citizen.Wait(0)
end

any help would be greatly appreciated!