When cutting out stringers and bulkheads, is a trailer enough support?

Engine, drives, tank, and all interior out,. Deck is fiberglassed on. I need to replace stingers and bulkheads and I want to know if additionally bracing is usually required. 33 ft boat.
Thanks,

Does it have a balsa core?

The hull no. 2 steps in hull. Trailer fits real nice.

You have that much rot in your 33? Which bulkheads are you doing? Just engine compartment forward one? Stringers in engine compartment or under cockpit around tank?