Just take it out on some roads and test it out at speed....... just pick a low traffic areas and have a friend follow a ways behind and help watch safely. I think you will be fine; but everyone goes through this with the first time they pull their own built trailer =)
If you have a small engined car or truck pulling the trailer you will find out if you can pull it at speed that way. This is kind of like pulling a parachute behind your car or truck.
Get you a big empty parking lot and practice turning and backing your new trailer with someone observing outside ...... you will amaze your friends in a short time of how good you will get at moving your trailer around.
Have fun camping in your new home-built trailer.
Pat
Life is to short always eat dessert first.
uÊ