You're President when the Gate is activated...

[Reliant121]

Thats because they never seemed to be able to hit anything. However, the Staff weapons caused very little scarring against the walls of SGC so maybe a good armour will protect an IFV.

[Aaron]

The Jaffa used a specialised type of Deah Glider with circular wings instead of the standard ones to fit through a gate specically. I guess a more circular IFV could be designed to fit through the gate if you wanted to which would certainly pose a problem for the Jaffa. However, the Staff Weapons might be more accurate and effective against a larger target.

You can fit an early LAV through the gate, given that a couple men can walk in abreast. I don't think a staff weapon will do squat against it, especially if you slap on the add on ceramic armour. Besides the increased mobility and cargo capacity of one would outweigh the negatives.

[Monroe]

They invented protective vests for SG personnel. Though I haven't seen them use it since they invented it

[Deepcrush]

They added them to the standard body armor that SG teams wear. Which I guess is why people later in the show get hit and live.

[Sionnach Glic]

Staff weapons are pretty unimpressive in terms of firepower. All flash, no bang. I'd say an armoured vehicle could survive a hit, given that trees can take blasts.

[Reliant121]

The flash and no bang would be consistent with the fear mentality. Naturally we fear a brighter and more obviously energetic object, than something which is more discreet.

[Tyyr]

Hell, if all else just use a layer of concrete for armor. Scrub the scorch marks off later if they really bother you.