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I tow with a 1 ton 4 wheel drive pickup truck with a 7.4 litre or 454 cubic inch V8. I cannot imagine towing a 31 foot trailer with anything less than that. My next truck may be a dually pickup, because of the stability the dual rear wheels add. Some here will no doubt disagree with me, but I have a lot of experience towing everything from heavy equipment, water tanks, hay, you name it with a pickup and trailer, and I know how different loads "feel" and what "feels safe". Get the biggest tow vehicle you can afford, with a big block V8 or diesel. Get a good brake controller and have it and your trailer brakes adjusted properly. If you do not feel safe, you won't be safe. Having a safe tow vehicle makes your trips much more enjoyable, and you will have a tendency to want to use the trailer more, because you won't be afraid to go anywhere in your Airstream.