Older Volkswagens use a unibody like frame often referred to as the pan. It is simple, flat underneath and light weight. It is able to take a fair amount of abuse and do much better than you would think.
If your frame is all rotted out, and you have lots of extra money, you can fabricate or purchase a completely redesigned frame. These often include reinforces subframes and improved suspensions.
A-Arm baja roller
Mendeola S2-T1 Chassis
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Zen's VW Baja
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