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playing a frendly game using an ork army against space marines
he roles and hits with a melta off a landspeeder and scores a weapon destroyed roll,
is the deffrolla on the front of the battlewagon a weapon or is it classed as equipment like extra armour as its not really a weapon but more of anenhanced spiky front of the battlewagon. the emportance of this is really im about to ram into a nearby squad of spacemarines
dose the weapon destroyed rull affect wreking balls and other equipment of the sort?
and do i get to pick the weapon destroyed or dose my apponent?

Deffrolla is answered in the Ork FAQ:

Ork FAQ wrote:
Q: Is a deff rolla a weapon that can be destroyed by a
Weapon Destroyed result on the damage table? (p55)
A: No

As is the Wrecking Ball:

Ork FAQ wrote:
Q: Are wreckin’ balls weapons when working out what
can be destroyed by a weapon destroyed result? (p93)
A: No

They get to pick which weapon they destroy.

As Insaniak noted, deffrollas, grabbing klaws and wrecking balls are not valid targets for weapon destroyed rolls.

Good luck squishing dem hoomies