If you were going under a 150 miles I might try your home made trailer, but I think you are just going to have problems trying to haul a mast with a home made trailer the miles you are talking about. When you have problems on the side the the road miles form no where it can get real costly and take a lot of time leaving the mast and coming back to pick it up. I would use a tried and true method if I was making the trip. At the very least I would drive a 100 miles with the rig and a borrowed mast to see if it works before you leave. You need to go on some RV forums and find a ride for your mast I have hauled a few on top of my RV for friends and my RV is 35' long.