Originally Posted by RUMSHIP
Is it legal to do this type of modification in the states, or do you have to go to Canada? I would think that if it were legal in the states that there would be shop in every state modifying mini vans to tow 34'. Just saying. Enjoy
If you think about it, the Canadian market is a more fertile place for this modification than the US. Gas and vehicle prices are higher there. Here in the US it's somewhat easier to justify/tolerate the purchase of a bigger truck.
Towing ratings are set by manufacturers based on their testing. The biggest factor in the tests is powertrain cooling, measured by towing up a steep grade in Death Valley at 100+ degrees at highway speeds with the AC cranked, pulling a non-aerodynamic box trailer. It's a severe test - and it doesn't have anything to do with legality.
Manufacturers don't test cars to the same limits as trucks because market research tells them that buyers will simply get a truck or SUV if the want to tow. It doesn't mean that a unmodified car would pass the higher towing limit in the test - but it doesn't mean that it wouldn't serve the customer well when towing a heavier Airstream (aerodynamic and stable) in less extreme conditions either.