[RPG] How to temporarily neutralize magic things

In Arms And Equipment Guide.

Self-Propelled Vehicle: By animating the wheels, steering mechanism, and other moving parts on a vehicle, it’s possible to build a vehicle that doesn’t require dray creatures. Any land vehicle of Large size or smaller can become self-propelled, gaining a speed of 60 feet. It still moves under the direction of the driver and retains its usual maneuverability. Unlike with a normal casting of the animate objects spell, the vehicle does not become a construct and does not gain the ability to fight on its own. Caster Level: 11th; Prerequisites: Craft Wondrous Item, animate objects; Market Price: 132,000 gp; Weigh --

If you want it faster.

Speedy Wheels: This pair of wooden wheels fits most wheeled vehicles, increasing the speed of one so equipped by 10 feet. The wheels must be placed on the same axle to be effective. Regardless of how many speedy wheelsa vehicle bears, its speed increases by only 10 feet. Caster Level: 3rd; Prerequisites: Craft Wondrous Item, expeditious retreat; Market Price: 100 gp; Weight: 20 lb. each.

When limited to Player Handbook only.

Your best bet is finding a spell that propels the vehicle such as a level one halfling sorcerer who sits in a small cart and spams Unseen Servant to push him around. When you get level 6 spells you get animate object, which would be your preferred method. Then you could use craft wondrous item to create the above self-propelled vehicle.

The Animate Objects spell states (emphasis mine):

An animated object can be of any non-magical material. You may animate one Small or smaller object or a corresponding number of larger objects as follows: A Medium object counts as two Small or smaller objects, a Large object as four, a Huge object as eight, a Gargantuan object as 16, and a Colossal object as 32. You can change the designated target or targets as a move action, as if directing an active spell.

So enchanted objects are not a valid target.

Also, a construct could be custom-built to hold a Wand but it would not be able to use a Wand. Wands are activated by using Spell Trigger:

Activation: Wands use the spell trigger activation method, so casting a spell from a wand is usually a standard action that doesn't provoke attacks of opportunity.

And to be able to use Spell Trigger, you need to have the spell on your class list:

Spell Trigger: Spell trigger activation is similar to spell completion, but it's even simpler. No gestures or spell finishing is needed, just a special knowledge of spellcasting that an appropriate character would know, and a single word that must be spoken. Spell trigger items can be used by anyone whose class can cast the corresponding spell. This is the case even for a character who can't actually cast spells, such as a 3rd-level paladin. The user must still determine what spell is stored in the item before she can activate it. Activating a spell trigger item is a standard action and does not provoke attacks of opportunity.

Animated Objects don't have any class levels.