. If you are referring to the dinette/bed seats when you mention the rear, those should be screwed in to a wood frame that is attached to the shell.
My 1976 Neonex trailer is of a different construction than most other Bolers I have seen. the trailer appears to be totally fibreglass, including the wheel wells, and the seats appear to be one large molded section, making it difficult if not impossible to remove them.
I recently re-wired a friends' Boler
and was amazed at how simple it was as her benches were easily removed allowing for easy access.
Check to see if your trailer is all fibreglass or if it is a combination of fibreglass and metal.