So you use a 10" wheel and it drops the section width down to 14.2 section width and will lose a little tread width also as the tire will curve alittle more...
So If they open up the tub the way I decribed you would need the tub opened up to 15"+ to give you the 1/2 minumum width needed on each side of the tire for rub issues...
If you really want a super huge tire in there wihtout cutting up th tub and will have a 12" tread width let me know.... it'll cost ya though....... ahhh nevermind you said you would let me stay at your house if I ever vacationed there.... free info. I guess