micromobility - Ebikes, scooters, longboards: Whatever floats your goat, this is micromobility
Ebikes, bicycles, scooters, skateboards, longboards, eboards, motorcycles, skates, unicycles: Whatever floats your goat, this is all things micromobility!
"Transportation using lightweight vehicles such as bicycles or scooters, especially electric ones that may be borrowed as part of a self-service rental program in which people rent vehicles for short-term use within a town or city.
micromobility is seen as a potential solution to moving people more efficiently around cities"
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You could go with a Razor MX500/MX650 and swap the motor, battery, controller ($500 stock and 15mph). With new powertrain, they can go up to 65mph with $1-2K in lithium and brushless upgrades. Don't forget to upgrades brakes and suspension. https://razor.com/products/electric-rides/mx650-dirt-rocket/
If you want something bigger, more Surron-ish, and not DIY, go with the Talaria XXX ($3150 45mph). https://lunacycle.com/XXX/
If you're looking to keep it mini, check the Emove RoadRunner ($1350 35mph) or RoadRunner Pro ($2500 50mph). https://www.voromotors.com/products/emove-roadrunner
Electro and Co. also sell a complete minibike called the "Electric Trail Machine." Its $3000 and goes 40mph but is only occasionally in stock. https://electroandcompany.com/collections/bikes/products/etm
The EBOX 1.6 or 2.0 are another great option. They go for $1350 (28mph) and $1650 (32mph) respectively. https://eboxelectric.com/ebox-electric-pit-bikes-1-and-2
These are just a few "minibikes" that come to mind. Prices and speeds are approximate. It really depends what terrain you want to ride, what range you need, and how fast you need (or want) to go, and if you're looking to mod it down the trail. Cheers mate!
Edit: I missed the part you wrote about riding on sand. You'll want as much power as you can afford and paddle tires.