I think they exist... I have seen some that are really close in Snowmobile trailers, but even then those are not quite right... I think i'm looking for the height of a toyhauler but empty...
I'd rather have the wheels tucked up inside a bit, but if I oversize tires on most low CG trailers I could wind up with rubbing problems. Though I have seen some trailers that are set up for oversized tires, but they tended to be smaller than I want and heavy with steel.
I like the weeroll companies construction, but they don't seem to make anything as big as I want, but I haven't called them to see if they can (or what it may cost...)
I'm also intrigued by some of the optional suspension systems I have seen, one that can be retrofit onto existing trailers that seems interesting is by
adventure trailers and they can retrofit their system for about 2k. In addition that looks like it will allow raising and lowering of the trailer from the airbag suspension, and it would integrate a compressor so I don't have to carry a separate one. It also can be setup with the same bolt pattern as my truck, which is nice as well.
Time will tell what I end up with, there are so many different options and opinions. If I could get the single axle from adventure trailers It would mean I wouldn't care so much about straight axles or the trailer being quite so high. There are some horse trailer suspensions that are air ride as well, which may serve my needs as well, but anytime you put boat, horse, offroad, i.e. anything fun the price goes a bit nuts...