Probably a third of the miles we have put on our 13ft 'Scamperoonie' over the last fifteen years have been off road, and in some pretty gnarly places like over Mosquito Pass in Colorado back in the mid 90's ---eighteen miles of low range low gear creepy crawl from 10,000 ft to 14,189 ft if I recall from Fairplay to the pass and to Leadville.
A few years ago I changed our old worn out front facing axle
for a trailing 45 degree down angle new Dexter unit. it not only raised the whole trailer about 6 inches, but gave us about 12 1/2 inches of clearance under the entire trailer with the axle at about 11 1/2 inches.
I dragged the Scamperoonie over about 55 miles of some of steepest sidehills, uphills and downhills, boulder infested, rutted trails, turning around once in about a foot deep creek bottom when the the road ran out this past fall
here in western Montana. Ground clearance cannot be discounted in offroad situations. It took all day and we hardly ever got out of first and second gear low range in the Tacoma with the rear differental lock on.
My advice would be to order the new axle and go with that, as the camber and alignment will be correct. Trying to flip axles and rotate them may cause more problems than they might solve.
My axle swap took one day by myself on my pal's auto lift with a torch, a 4 inch hand grinder, a wirefeed welder and a transmission jack with a tape measure and the appropriate steel tubing, angles, and flat stock to fabricate the new spring mounts.
Without a lift, the work would be very hard to do in my opinion. If one was not proficient with the use of these tools, a good welding or fabrication shop is needed.
high quality welding without burning up the trailer requires some skill, as the steel thickness of the these trailers is typically pretty light
What ever you decide to do, plan it well, and make sure you have plenty of time and enough material available.