Yes he can put a bigger tub in, if they brace the floor but we do not carry left over materials from contractors jobs we never have. We get most of our materials from mobile home manufacturers when its damaged or scratched or dented and they cant put it on a brand new mobile.
They only have whatever is leftover from a contracters job I dont think you could use such a tub because of the weight of standing water the tub would go straight through your floor
I think that you need 60" to install that size tub
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