It might not be a bad idea to contact Scamp directly. Looking at pictures of them, it appears that the conventional hitch location of slightly ahead of the rear axle might indeed cause issues with this trailer, since the overhang appears to be much shorter than a typical 5th wheel trailer. For an 8 foot bed, the hitch would probably need to be well behind the axle, which would not be a problem since the advertised pin weight it just 400 pounds. Even if it was 600 fully loaded, no problem for a dually. Another issue might be the height of the truck bed.
On the website the hitch type was unclear, other than it appears to use a 2" ball rather than a traditional kingpin.
These trailers really do seem to be designed to pull with smaller trucks, but that doesn't mean you can't make it work with yours.