I am a bit biased to Hawkins since I own one. I know nothing about the Fleetwoods of that era. Keep in mind that Hawkins no longer exists and if you get one on a John-Deere chassis, they no longer make RV chassis. Freightliner actually owns the chassis rights as of now and some parts are available through them. Seems like the hardest parts to get ahold of are brake rotors.
There is a Hawkins club page with links to owners manuals and schematics. Hawkins used brand name systems and I have not had any problem locating parts or manuals for anything on this coach. It is built very sturdy. Make sure which ever way you go, to thoroughly inspect everything!
'88 Hawkins HB341
460 Ford on a Deere chassis