Basically you probably want either an fm1 or fm5 whether it be a 420 or 520. FM1 is manual,solid axle, no power steering. FM5 is manual,IRS and no power steering. Sold rear axle better load carrying and towing, IRS more comfortable ride. Anecdotally we see more roll-overs with IRS. IRS are higher maintenance and dearer to repair when they crap out. FM2 and FM6 are power steering equipped. Solid axle are drum brake, nothing wrong with them. IRS are rear disc brake. Hope this helps.
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