I have my 285s on 16 x 8 modulars with a neg 32 offset. After a year of hard use, I've had no problems with wheel bearings -unlike the spacers that I had on previously.
265s would be unsafe on a 10 inch rim, they are meant to go on a 7 inch. There is no reason why you can't fit them to an 8 inch (i think ), although you may increase your chances of pulling the bead off at low pressures. What reason are you wanting to fit wider wheels for?