In many cases the 8k hitch cannot be used. If the GCWR minus the scaled weight is less than 8k then the full 8000lbs cannot be used regardless of the hitches rating. It is always the "lowest weight of the following". (Or its the GVWR minus the scaled weight being less than the allowable tongue weight.)
A few years ago Thor started installing 8k hitches, before that it was only 5k hitches. (Unfortunately we only have a 5k hitch.)
As with many things on the motorhome I'd guess Thor got a deal on them and simply installed them on all the units--that is cheaper than keeping different parts around.
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