How do I ensure a model is fully loaded after being cloned?

Hello!

I've run into an issue while working on a new system. The goal is to be able to clone a vehicle from ServerStorage into the game. However, this vehicle should only show up locally- as it serves as a preview within the dealership. If it is server-wide, then the vehicles will be replicated across all clients created a mess of vehicles in the same exact spot.

To combat this, I wrote the following two scripts. One is a LocalScript that sets up the vehicle preview page, the other is a server script in ServerScriptStorage that handles client to server events.

LocalScript

local player = game.Players.LocalPlayer

script.Parent.MouseButton1Click:Connect(function()
    local reference = script.Parent.Parent.Name
    --this script is in a button, and the name of the button is the reference for the model
    game.ReplicatedStorage.Events.dealershipPreview:FireServer(reference, "SETUP")

    --this section of code is supposed to set up the local preview car.
    local preview = game.ReplicatedStorage.vehicleQueue:WaitForChild(player.name.."_car"):Clone()
    wait(2)
    preview.Parent = game.Workspace
    preview:SetPrimaryPartCFrame((workspace.Dealership.Preview.Preview.CFrame + Vector3.new(0,4,0)) * CFrame.Angles(math.rad(90),0,math.rad(90)))
    player.PlayerGui.Dealership.Dealer.Visible = false
    player.PlayerGui.Dealership.PreviewPage.Visible = true

ServerScript

game.ReplicatedStorage.Events.dealershipPreview.OnServerEvent:Connect(function(player,data)
    if data == "SETUP" then
        local car = game.ServerStorage.Vehicles.Civillian[data]:Clone()
        car.Parent = game.ReplicatedStorage.vehicleQueue
        car.Name = player.Name.."_car"

This works, as in it replicates the vehicle, then clones it locally. However, the model hasn't finished loading by the time the LocalScript clones the new vehicle in game.ReplicatedStorage.dealershipQueue. I've tried using things such as :WaitForChild() or a simple conditional however none of these worked. How can I ensure that the entire vehicle is loaded in before cloning the vehicle locally? From my research, I've seen some developers recommend using the RunService, but I have yet to find an explanation of how to utilize it. Any help or guides is super appreciated. Thanks!