I installed US-made Timken bearings last fall. Got them at a local industrial/commercial bearing supplier. I said I wanted US ones or none at all. They said theirs are all US-made ones so they can't that hard to find out there. I will gladly get some for folks for a small handling fee... :B
Not sure why higher rated springs & axles one or two sizes would be an issue? I would say better to have stiffer to tame the bounce in the rear end and improved handling. Our particular TT would normally have 3500 lb axles but we have 2 x 4400 lb axles. No downside to this for us and there is a lot less bounce and handling is improved. Also installed shocks along with this upgrade and together make a world of difference. I would say going too stiff may not be good but it seems to me that FW frames are much stronger than TTs.
