I built a Isuzu several years ago for a smaller fifthwheel at that time I had all the metal working tools plasma cutter mig welder , I have a friend that has a 2014 international With sleeper he just about wants to give it away 7,000. Dollars it has 750,000 miles I have thought about putting a bigger one together but being 73 yrs old I may not be up to it ,I want to haul a 2018 Ford Edge I like some of the older fifthwheel Travel supreme those were well built units I can’t buys these new Fifthwheels but 150,000 is way to much for me