No sweat mate
I'm only guessing on the Q5... but to me, the gearbox isn't really suitable, and at the end of the day, it's a "compact SUV", so is likely a bit out of it's depth body structure wise to handle towing a 2 tonne load. It's effectively an A4 lifted up..... so can't really be compared to a heavier 4WD like a Toureg.
There's great deals to be had on Touregs now, so I'd grab one up.
I just can't fault the Toureg, with the exception of disliking the blue backlight on some displays, as I found them hard to read at a glance. We literally didn't know the R35 was behind us.