I have two mobility scooters that I love. I can walk a little, but not much.
I have a Golden Buzzaround EX and a Golden Buzzaround XLS-HD. In UK those same scooters are sold under names TGA Zest Plus and TGA Zest.
I have added many accessories. Most are easy bolt-on or strap-on bicycle accessories, such as Cat Eye blinking safety lights and a Cat Eye headlight. A pair of LOUD USA luxury car horns on the EX/Zest-Plus and a reasonably loud tiny bicycle horn (sounds like Japanese car horn) on the XLS-HD/Zest. Also some TGA accessories I bought online from an England TGA dealership: Steel rear wheels with pneumatic tires and nice seatback cargo carriers on both scooters.
The TGA Zest Plus pneumatic wheel/tire assembly comes with 9" pneumatic tires (fits both scooters), and was a great upgrade for both scooters. In the case of my XLS-HD/Zest scooter, this was a 1" rear tire diameter upgrade, as well as an upgrade to pneumatic rear tires. For my EX, this tire was similar diameter as stock, but was an upgrade to pneumatic rear tires.
I made those upgrades 6 months ago. Current upgrades in progress this week are battery upgrades to both scooters and a tire diameter upgrade to 10.25" rear tires on the EX.
I couldn't find a mobility scooter forum that is active. The closest I have found is this power wheelchair forum and a golf cart forum.