I recently bought one of those harbor freight 4x8 folding utility trailers for $150. It works for what I need it to for now. But when I have it loaded, I know it has to be near the 1450 limit on the VIN tag. My dad also got one of the traielrs for free, but He only needed it for the tires. So here's what I am planning on doing. Please tell me if it is safe to do and if you have any modifications, please advise me. Thanks. The single axle / spring that is on there would be moved back 1/2 of the length of the wheel (moved back about 6 - 8 inches or so) and welding in the complete axle/spring/shackle setup from dads trailer just in front of the current axle. Basically converting it to a dual axle. The reason I want to do this is because I want to fully enclose the trailer into a steel box trailer. My dad pointed out that the weakest point on the trailer is where the tongue meets the frame of the trailer. I agree, so what I am thinking about doing is making the box go all the way up to the tongue. Basically if you looked at the trailer from a top view it would look like an A frame house (or barn, you know the type of houses that kids draw). That will put some much needed support on the tongue as well as increasing the interior volume. Since there would now be 2 axles, that should increase the GVWR of the trailer. Anyone have any pro's or con's on doing this? Anything I should watch out for? And finally, Since I am converting it from single axle to dual, enclosing it and effectively making it a higher GVWR, do I need to let the DMV or CHP knoww hat I have done so there are no discrepancies on the paperwork? Thanks alot.