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First, how long are the weekend trips? If not over 40-50 miles, a plug in electric is ideal for this situation. For snow and ice conditions, your need for space, and size for safety, I'd suggest a awd Chevy Astro Van conversion. There would also be enough room for a small, externally vented generator to extend the range on trips. With "long range" not paramount, affordable lead acid batteries could be used, and mounting them below the floor would provide excellent handling. If building one up from parts cars, like starting with a van with a blown engine, a standard 4x4 truck transfer-case would allow selective 2wd-4wd. Even better could be two motors, one main for rear drive, and a second on the front axle for low traction situations.
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