Gus, I could not agree more with the above as I had many of the same things happen to my 31 Sovereign
. I have replaced the AS hinges with much heavier stainless steel ones (Home Depot) and the new hinges were installed with 8X32 screws after the framework was drilled and tapped and a 1/8" steel backing plate is also drilled and tapped on back of frame and a lock nut behind that.None have become loose in 5000 miles of road travel.
I replaced and relocated the power supply unit with a lighter more efficient one. When I got the trailer the factory PS had broken away from the wall and was laying on the pump ! ! ! ! ! The new one was re-located and now mounted on bulkhead between galley and bedroom area.
I also had to rebuild the sliding door coil under sink and if it ever gives trouble again will be replaced with something else like sliding doors that will lift out of tracks easily
I have also replaced the plastic drawer runners with angle iron appropiately milled to fit and the 1855 mile trip we just came in from confirmed they are working fine. I have also milled door catches from angle iron and they stay shut on the road now.
I have talked to three other MEs and they all say what you just said quite well about the axle capacity limitation.I have done lots of work beefing things up here and there and replacing the axles with much heavier ones on Friday assuming they come in then.
I replaced the AS wheels last year with 16" rims rated about 300 lbs heavier than original and installed 10 ply light truck tires that call for 80 lbs pressure. I now have 5000 miles on the tires and no visible wear. They are modular steel rims from Tredit Corp who only make wheels and they are suppliers to industry trailer manufacturers.
I think the tires are rated at 3800lbs each.
Hope you can post the data you get from AS that is assuming they give it to you which I would not be surprised if they keep it close hold.
73s de AC4HT