Leveling kit/ wheel offset

Good evening! I've got a 2019 Crewmax XSP. It currently has a 2in lift in the front and due to the fact I tow frequently and have the topper with a decent amount of weight in the back. For the time being I threw a 1in block in the back. It came with the 20in rims which I'm "ok" with would prefer 17in or 18's. And 285/55r20. The rims to the best of my knowledge are +50. I'd like to get them out just a little more. Do you guys think with 1.25 spacers and my lift I could get 285/65r20 on it or should I go with 285/60 or another size? All the flaps are already removed. I have spent nights reading and searching the forum but not a lot of people seem to be running a 2in front 1in back set up. On down the road I plan on going Bilstein 6112/5160

Thanks ahead of time