I built my overland trailer from a Harbor Freight Super Duty 4ft x 8ft. I chopped it up & done lots of mod's new suspension system, shocks, I welded all the joints & fabricated a custom tongue. Don't let anyone tell you different. I've had my trailer in some rough trails w\o any issues. Heres my build
https://www.facebook.com/don.mullis.12/media_set?set=a.656437761071768&type=3&fb_dtsg_ag=Adyp0t8Z_6CrXqIdfFrtIV4wM9yFQxDuCuFRhJiSV-u0Eg:AdwqL1m4vHlo0Cs0-XOBbiaHQ3WPE2XrSklX8YmzIWgdbg
1st photo is when I finished the Harbor Freight Super Duty with lots of mod's, new suspension system w\shocks I fabricated the tongue & reinforced by extra metal & 10lbs of #30 welding wired used.
2nd & 3rd & 4th photo is the finished overland trailer built from a Harbor Freight Super Duty Trailer.
5th is the wife & 30 miles in dispersed camping. The roads were washed out & rough in some spots. My trailer done fine on offroad travels.
Don't let anyone tell you Northern Tool, Harbor Freight, Lowes trailers,, boat trailers are cheap or lousy to build off. 1st no disrespect to any one here do not let any one tell you....you shouldn't use this type of trailer you asked or the ones I mention wouldn't make good trailer build as of over land chassis. I know of many who built some fine adventure trailers from these types of chassis "if" they modified them. 2. any build can produce a piece of junk adventure trailer "if" the individual cuts, cheap'n on the parts suspension, reinforcing of the build. Your build will be as only as good as it is what you put into it. Many will hurry & slap things together. These are the junkard's.
My build took 9 1\2 months with 6 months of planning.