1972 Holiday Rambler Travel Trailer

Just bought a one owner 40 year old Holiday Vacationer and probably paid too much. It is in pretty good shape as far as appliances, a/c, heat, cushions, tables, windows. It has a fiberglass roof, no sign of leaks. Fresh water aluminum tank replaced with fiberglass one, new propane tanks.
Had original manual and brochure - even the receipt!
We lost a tire while moving it and the rim and bolts were all gone with the tire. We are looking to replace a few things right now and I'm wondering if anyone can point me in the right direction.

4 star style rim
Holiday US shaped logos (3) yellow that are screwed into the outside.
Wheel well trim - hubby is trying to repair fiberglass
Any ideas for polishing the exterior trim (galvanized aluminum?) Tried Mothers for chrome and aluminum with no results.

Thanks! I will try to post pictures soon.