Furnace blower noise

We have the trailer back in storage and the paperwork with all the info is in the trailer. We are camping next weekend so I could look then to see what brand. I just thought Keystone would use the same across the board.

WHAT BRAND HEATER?
USUALLY THE MOTOR NEEDS CHANGING.

There are videos that show how to change the motor but I cannot direct you to the right one because you have not provided needed information.

I would think that with the age of the furnace, a bearing would not go bad that quick.
I believe that the furnaces us a single motor for both the air blower and the combustion air too. These are held in place by "allen" screws, and wondering if one screw got loose causing blower wheel to move and hit side of enclosure that caused noise.

I found out a lot about RV furnaces when a Mud Dabber got into the combustion blower section of the furnace, and the nest came loose and jammed up the blowers. On a cold morning I had to take the furnace out and disassemble it on the table to remove the nest.
Furnace had always vibrated a lot before I made repair, and after that it ran nice and smooth. The nest had been on the blower wheel before it came loose, which made it go off balance and caused the vibration.