I think you'll struggle with a '275' in honesty.
It's best to err on the side of caution and go with a 265/30.
OK it's a stretch (265), but a 275 might not rub with just a driver,but stick a load in the boot,or two back seaters/shite Baghdad stylee roads, and I'll bet the sidewall on a 275 will get warm.
Go Vreds from Camskill,good tyre,you won't be disappointed
You could also consider rolling the arches.