perfect example of why Harbor Freights, Northern Tool trailer frames fail in post #19. Simply bolting a Harbor Freight\Northern Tool trailer frame together with it's stock leaf springs w\o modifications & fabrication to the frame & tongue will not hold up to trail use. Taking that stock flimsy HF or NT frame out & about on the trails will cause tweaking & loosen of the frame fasteners making the frame useless.
Like in my 1st post #11, states welding the joints, adding a 2" thick wall back bone, changing out the suspension adding shocks with shock mounts will help make the trailer more trail worthy. Just those items done strengthens the frame, adding shock to the suspension will keep the fires planted more on those bumpy roads & makes for a smoother ride for your gear.
Compact Camping Concepts web sites show perfect examples of explore box adventure trailers built from these frames & fabricated frames.
https://compactcampingconcepts.com/ https://compactcampingconcepts.com/explorerbox/.
Scott built many of these budget friendly adventure trailers that have been deep into Oregon Wilderness as well as his customers have all over this country.
The trailer tongues on Harbor Freight & Northern Tool trailers are not stout enough to handle trail use. They are very flimsy & weak. Scott show the basics on one of his web sites "how to's" to make these trailer frames trail worthy.
https://tventuring.com/trailerforum/thread-888.html
People get in a hurry slapping things together expecting them to handle the riggers of trails & common offroad use. I am NOT expecting any one to go to the lengths I gone, BUT my trailer & chassis is extremely trail worthy. For some one to demonize Harbor Freight or Northern Tool trailer frames are just going off here say from others is NO more creditable than just guess work & speculation.
I can only speak for Arkansas, registration & titles w\ plate were at the revenue office, gave them gross weight loaded, DMV will give you VIN ID which you can put the VIN # on a plate (which I did) install permanently on the trailer right side tongue. This way I insured my trailer with my insurance company too for the cost of the build plus items in it.