Regardless, if you want to use 255/50-19 tires, the max recommended wheel width is 9" - so 10" is too wide.

However, If you want to be able to use your existing staggered setup with the SAME tires front & back - you can use 275/45-19 safely.

275/45-19s can be mounted all the way up to 10.5" wide rims.