How does your wheel fit now? That is the starting measurement. With the mini-tub, I would recommend going to an 18x12 and adding the two inches to the backside of the wheel, assuming you like the front space on your current 18x10. If your 10" can be moved out say .50", then a 7.5" backspace will work well.
Tire selection is vast in 18". What tire brand is on the front? Better to try and match front with rear tread patterns.
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