I would base my axle choice on your tow rig. Use an axle or axles that use the same wheel and tire you run on your truck. Probably one 7k pound axle will use a 16” wheel with your bolt pattern. A straight axle will also provide ground clearance but you will need longer ramps to unload the “toys”.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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