2-2-2 URD and a #6 thhn ground pulls nicely in 1 1/4 pvc
You can't use 310.15(B)(6) since a garage is not a dwelling, so table 310.16 would require 1-1-1-6 for Aluminum.
I done many and never had a problem, but here I install a double lug meter and just come off the meter and go right back in the ground and hit a main breaker in the out building, this way they are still considered service entrance conductors and you only need 1-1-1 no 6 grounding conductor, bonding and grounding at the garage panel will be done just like a service, it can save money sometimes, since your not required to have a disconnect at the house, you also don't load any more current on the house panel.
But check with your AHJ as some will freak out not having a disconnect at the house.
The NEC only requires a disconnect where service conductors "enter" a building, not where they exit a meter base and go right back into the Earth.