Mitsubishi L200 or Nissan Nivara?

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We are new to caravanning and have recently purchased a Ace Jubilee Viscount 2007 (twin axle), one of the main reasons we bought it is to go to race meetings which means camping is in a field.  We have been looking into two vehicles and found the Nissan Nivara or the Mitsubishi L200  - heard good things about the Nivara but lots of conflicting information about the L200 and there back being a bit light.  Can anyone who has one give us there advice please?  Many thanks