Honestly, I'd say don't bother to try find one. The owners manual that I got with my Surveyor was absolutely worthless. You are better off, IMO, to try to get manuals for all the your individual "pieces". Refrig, furnace, axles, etc. But that is a lot of work. I'm not sure that there is a good answer for you. I know that's not what you want to hear.
2012 F150 FX4 Ecoboost, 2016 Surveyor 274BHS
2003 Yamaha FJR1300, Demco Premiere Slider
1969 John Deere 1020, 1940 Ford 9N, 1948 Ford 8N
Jonsered 535, Can of WD-40, Duct Tape
Red Green coffee mugs