I have SCA3 and have looked into best devices to assist getting around safely.
I can recommend the E-Traveller Electric Rollator.
It is available from various providers.
It can be used for:
- control of walking speed
- deal with potential slips
- can be used for controlled decent.
It has many uses, and can be used as an electric wheelchair when it is too demanding to walk. Look up videos showing what it can do.
I think this device provides necessary functionality for supporting your independence when out and about by yourself.