I'm personally holding out for a mk31 but no luck so far, they just added 5 more and they're all mk23's.
Starting to think that it might be better to buy one of those and just add a fifth wheel to it at a later date, use the flatbed to haul around an rv box and then maybe modify the flatbed latter on to were it can hold both the fifth wheel and still be used to haul around the rv bed if I need to.
Main difference between the both of them are the suspension on the mk23 which might be easy to swap out for the hendrickson since both vehicles are similar, the rear steering on the mk31 might be more trouble than it's worth and I'm guessing if it breaks it might not be easy to repair or fix it so it doesn't turn anymore like they did to the ITV's.