Hi Paul, welcome to the board. We have heard of the elusive Biggar
several times and have only seen an exterior picture. Would be great if you could post several pictures to give us a better idea of what you have.
If you have any specific questions, ask away and we will try and invent an answer that won't send you too far down the garden path.
I would suspect that all of the components except the shell and cabinets are the same as were put in any of the travel trailers of the late 70's. Most of the hardware items are readily available or can easily be replaced with something of current vintage. Things like your axles were probably the same ones as used in the Boler
, just doubled up.
One of the jokes with the name is "it's just a Biggar Boler"