I think you need to take a look at TT and 5ers as there suspension is nowhere as good as a truck suspension is. How many times do you have to change the bushings on a truck. There are trailers out there that have had the bushings wear out in 10,000 miles and also the shackle bracket holes oblong out and have to be replaced. I have had a few 5th wheel and the best ones have grease able bolts and they still well wear out rather quickly compared to a truck. I have seen trailers with broken and bent axles, when was the last time you seen a pickup with a broken or bent axle?
I think the truck suspension is far superior to the trailer ones. This is IMO.