furnace squealing

I have a older 2000 forest rivers cherokee 37k Camper and of course it is on my camp spot so I cant walk out to check it. But last weekend we went up and cleaned up for the season and fired up the furnace and it squealed really loud for about 1-2 minutes then quite and worked fine. We ended up shutting it off and turned it back on about 6 hours later and same thing. I assume I need to try to oil motor bearing or replace motor I was going to try to make sure I have everything I need to oil it this weekend to use it and try to get some motor numbers off it. Is there any clue what furnace I have with make and year to try to locate a manual. From the best I have looked around and the best I can remember two years ago when I had it out I am pretty sure it is a suburban furnace. I guess If I am pulling it I should replace both the height temperature limit switch and the sail switch along with blower motor.