From the quality of the photos, I can't tell if the chassis a modified stock one or something the builder conjured up from something else. I strongly suspect the latter. That means adapting a stock axle
or returning the trailer to a normal length may be problematic. That probably means a new chassis. Anything can be done however if you are paying someone else to to do it, the low initial price will be dwarfed by these expenditures.
Now if you are interested in owning a monster trailer, this might just be the one for you. The outlandish attitude doesn't necessarily make it unroadworthy if the underlying work is satisfactory. It depends on what the laws allow in the state that you are in.