Why put a 10.5 in front when the widest tire you'll be able to use is 275, without wheel spacers that is. Anything wider than 9 inch rim is just an unecassery wight in my opinion. The rear might take 285 with the right offset, wich the 9 inch wide rim should be able to handle. I am not a fan of wheel spacers because sometimes they might mess with the balance and give one a bumpy ride if not aligned properly when wheels are installed. With that in mind, I think 9 inch on all 4 corners with 275 would be an excelent choice and is very doable.