can we shoe horn in a 285/45 rear on an 18X10 wheel? its a work wheel the Vs/SS's and an 18X 8.5 upfront with a 245/30 tire on it?

 

Rear tire profile is way too high, you can fit a 285 rear with a 18x10 wheel with the right offsets, Fronts I would say no to the 245 without fender mod.

 

the only way you can get a 285 with a 18.10 is a Custom HRE wheel......and will probably need some fender rolling with some camber. If you dont have a turbo or lots of engine mods.....its gunna be hard to roll those with the stock HP which will be pointless unless its a showqueen

 

you'll need something like a +60 to +70 rear offset and a 285/35 or maybe even 285/30. that all depends how much fender work you wanna do though.

 

The tire size would need to be 285/30R18. You would need a very high positive offset to make the tires work. Like was mentioned before you would need a lot of horsepower to make this work.
If I can help with the tires let me know.