The op didn't ask anything about his truck buttt.Here we are..I have had three full sized truck campers on 1/2 ton trucks so I have an pretty good idea how they handle..
1-1957 GMC 1/2 ton w 8ft Sturdi built overhead truck camper with re-arched springs..This worked good even pulling a two horse trailer loaded heavy.
2-Brand new 1976 Chevy Scottsdale 1/2 ton with brand new Security 8ft truck camper with coil spring overloads..
3-1983 Chevy 1/2 ton with coil spring overloads and an older Security 8ft TC..
All worked great and were well taken care of and did not leak oil and there never was a braking issue..
List your experiences with a 1/2 ton and a full sized overhead TC..
Good luck to the op and his build...