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My guess is that solid axle would be easier to adapt than IFS and it would depend on how strong the IFS is (solid axles usually have a strength advantage). It would depend on how well the front suspension on the Raptor could resist the torsion that the portal box would put into the system. Most portal systems are indeed solid axle, but there are a few IFS setups, but they were designed specifically around it (Humvee, OshKosh, etc.).