<span class="ev_code_BLUE">Sometimes there are constraints at the factory. Either their production line/system is not setup for it or unable to handle certain options yet. To give you one example; I bought one of the first Avalanches and the dealer had to send out the truck to their paint shop to install the roof racks for them. Because the assembly plant wasn't set up to do that just yet. Thus the paint shop had to pre-drill the holes into the roof before they could attach the luggage rack on.
Lastly the dealers can install them for the assembly plants easier and sometimes at a cheaper cost.</span>
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