Does this truck come with upgrades shown on picture?

It comes with everything pictured. You will probably want to also order Oul filled shocks when you order truck. That's the only upgrade I can think of you will want

can we install 2 batteriey packs at same time?

If you had the right connection to connect them in parallel to the car you could double run time. On two batteries. Make sure its in parallel tho.

How come when I turn the knob to full speed the truck doesnt stop moving?

Always turn on the car before the controller

Do these trucks use a 12mm wheel hex?

Yes, they use the 12mm wheel hex

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HAIBOXING RC Car 16889 1:16 Remote Control Car for Adult, High Speed 36km/h RC Truck, RTR RC Crawler, 2.4G All Terrain Waterproof Off-Road Vehicle with 2 Batteries for Kids Boys 8+

HAIBOXING RC Car 16889 1:16 Remote Control Car for Adult, High Speed 36km/h RC Truck, RTR RC Crawler, 2.4G All Terrain Waterproof Off-Road Vehicle with 2 Batteries for Kids Boys 8+

Product ID: 752865443

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⚡36 km/h top speed

🔋2x 7.4V 1000mAh batteries

🌧️IPX4 waterproof off-road

Description

🚀 Unleash the thrill – Own the terrain, own the moment!

ALL TERRAIN DOMINATOR - Conquer sand, mud, rocks, and slopes up to 45° with rugged suspension and shock-absorbing wheels.
BLAZING 36 KM H SPEED - Feel the adrenaline rush with a powerful motor that rockets this 4x4 RC car to thrilling speeds.
DUAL BATTERY POWERHOUSE - Double the playtime with two rechargeable batteries delivering up to 20 minutes of nonstop action.
PRECISION CONTROL ZERO INTERFERENCE - Enjoy seamless 2.4GHz remote control with a 250-foot range and two speed modes for ultimate handling.
SHOW STOPPING LED LIGHTS CUSTOMIZABLE STYLE - Turn heads with shining car lights and upgradeable parts to make your RC uniquely yours.

The HAIBOXING 16889 is a high-speed 1:16 scale 4WD remote control car designed for adults and kids 8+. Featuring a top speed of 36 km/h, dual 7.4V 1000mAh rechargeable batteries for extended play, and IPX4 waterproof rating, it excels on all terrains including sand, mud, and rocks. Equipped with a precise 2.4GHz remote control system offering a 250-foot range and two speed modes, this RTR crawler combines durability, performance, and style with LED lights and customizable parts, making it the perfect gift and hobby starter.

Specifications

Model Number	16889
Number of Game Players	1,1-20
Number of Pieces	1
Batteries Required?	Yes
Batteries Included	Yes
Material Type(s)	Acrylonitrile Butadiene Styrene (ABS), Alloy Steel, Metal
Target Gender	Unisex
Manufacturer recommended age	8 years and up
Item model number	16889
Product Dimensions	29.69 x 25.4 x 16.51 cm; 1.5 kg
ASIN	B08C9K34RZ