Long distance purchase

If it is a new rig there is a possibility a local dealer could/would buy it from the other dealer and bring it in to sell it to you. Of course the dealer that currently has it on it's lot will price it to your dealer with a profit for themselves, otherwise what is the point. Then your dealer will price it to you at a price that includes their profit plus the costs of bringing it in. That cost of transportation will include a profit for the transporter (450 miles round trip would be two days of wages for the driver, fuel, and food. There would be a night of lodging involved so plan on at least $600.00+). So you are probably going to run up $2500 to $3000 at a minimum over just buying it from the dealer that has it in stock. And there is no guarantee your local dealer will be as good or better than the original dealer or that you will get any quality service at all regardless of where you buy it.
Buying an RV is very much Caveat Emptor, let the buyer beware. I don't know of any manufacturer/dealer/repair center etc. that doesn't have a significant percentage of unhappy customers. You are basically driving a house down the road and that house has been made with the lightest, least expensive materials the manufacturer could find. Throughout the entire construction process of any RV compromises have to be made to keep the rig road worthy and the costs kept down to a point that people can actually afford to buy them.