Yes. While ideally I'd prefer a matching spare as I have now with 33s. Couple reasons I need to go this direction.
1) 35s are a bit too large in diameter to fit in the caboose. Interference with the suspension panhard bar would not be a great thing. Largest that I've heard is 34", or 34.1" in my case for the 275/65R20. I may still need to keep it somewhat deflated and ratchet strapped...we'll see.
2) I have the LRA 12.5 aux tank. That pushes spare tire mount down about 1". That combined with a super wide spare is not ideal for rear end clearance off-road as it'll hang too low. Hence the narrow 275 saving 1.5" width.
But what happens when you have a flat? Will your traction control or whatever electronic brain in the car tolerate the difference in size across an axle esp when you take a turn around corner?