Silver Streak floor replacement

[camper]

I need some advise on replacing my 1949 Silver Streak sub floor.I have removed
all the subfloor and need to know what I should be aware of as I put new sub floor in.
I am planning on 23/32 [old 3/4" size] then put a laminate finish floor on top.It appears to have had a 19/32" [old 5/8"] floor. I want to install new wiring for the 120V and 12V running lights.It did not come with a converter,so should I plan on installing one?
I will also install new insulation in the floor--What kind?? Thanks for all your help.