Got to echo Flipside101 here.

For all the community focus on the importance of DPS as a tank, strength builds being optimal, and vitality being something you should only need a certain (smallish) amount of, this mindset is really only for when you're tanking in a group with people you're comfortable with and geared appropriately for.

Alex2 is perfectly capable of being tanked in full strength, but most PUG healers will probably be more used to healing Vit tanks, or might be new to the encounter or a little undergeared themselves. Whilst all out strength is definitely the optimal thing for tanks to gear for, in PUG raids where DPS really isnt as important as just flat out not dying in 2 seconds, it's definitely a good idea to throw on more Vit gear just for security.

Or at the very least, warn PUG healers before a pull that you're going to be tanking in full strength so might need a little more babysitting on some of the tougher pulls. Two jagd dolls at once can smash the face in of any unprepared tank even in vit gear if a healer is a little sleepy.