The RadTrike is an electric tricycle aimed at stable transportation and errands, and drivetrain alignment issues (chain tensioner and derailleur setup) are common early-life "tuning" repairs rather than end-of-life failures. If shifting is inconsistent or the chain drops, a professional adjustment or replacement of bent derailleur hangers/tensioner parts is typically a good repair choice and usually stays well below the threshold.
Replacement is more compelling if the trike has sustained crash damage, persistent electrical faults (display/controller/cabling), or a battery that is already showing major capacity loss-because battery replacement can be one of the largest costs. Also consider how the trike is used: heavy loads and frequent hills accelerate wear on chain, cassette, and brake components, so recurring drivetrain wear may be normal.
If the frame and motor system are sound, keeping it and servicing wear items is often the most economical path. For safety, prioritize brake performance and secure rear axle/hardware torque, since trikes experience different lateral loads than two-wheel bikes.