I don't own an
, and I have a twin axle trailer (original moved and second added by PO), but there are plenty of members here with OEM single-axle trailers who've towed them long distances. Highlander comes to mind, when he moved almost the whole way across Canada. Beene and Dreamer have/had singles and tow some distances, and I believe BOAT has a single and tows all over the place.
The big concern for me would be the tires, though. Roger didn't spend any more than he had to on these trailers, and while the load rating may have been there, small trailer tires, and axles for that matter, are 'optimistically' rated, IMO. They'll carry the load, but at max rated load they don't last long. Ask anyone with a travel trailer; they have a reputation for blow outs.
If possible, go to a higher ply/load rating, though if they're 14" with load rating "D", I don't think you can go any higher without going to 15", which may not fit. Having more tire than you technically need is not a liability, just like having a heavier axle (but not springs). Bearing fatigue life (B10 life) is very sensitive to load, and a small increase in load make a large decrease in longevity. I don't know for fact, but I suspect tires are similar.
Oh, and avoid cheap Chinese tires. I have a set of four, but they're running at about half their rated load, and they're fine. Over on an RV forum I frequent, the general advise is to use good quality trailer tires (for travel trailers and 5th wheels) and stay away from the cheap stuff, but I can't say what brands would quality as I haven't had to concern myself with that.