Hi.. Well whatya know I'm up to the same thing here in the west Kootenays. Last year I restored a 73 Boler
for my Daughter.. And learned a lot.. It realy pays to add more steel to the frame... because there are week spots. I just finished my second frame for the 79 Scamp
I'm working on this year. The Scamp
has the floor bump out under the front like I see in your photos. BUT look what else !
Extra framing ... This is factory too... so that tells me that they had so many problems with the older frames. Where the frame bends up front was bad.. and lots broke on the drivers side. This extra framing solves that. I also do the same for the back of the trailer.. Again a problem with the long frame on the drivers side.. it sags over time .. and the dinette floor has to span that huge open area? I add more steel there to help.
Now you won't worry about the sagging floor.. and the main frame has help.. only added 50 lbs to the frame.. Better that 50 lbs of plywood.