Congrats on starting your own home on wheels. Ifi read correctly in some of your other postings you were trying to figure out about toilet or not.
The box conversion i did/doing (work in progress) Has no toilet or plumbing of any kind. since I am almost always staying in campgrounds that have a bath house it is a unnecessary need for me.
This one below is 2012
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This one below is 2011
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I saw a american standard whirlpool tub at lowes for $398 and i must say i am tempted.
My stumbling block with it is the large amount of hot water to make it work. I'll have to do the math and firgure out what that amount is.
I have right at my budget amount in mine ($7K) and I am close to backing off on yearly upgrades.not because of the money but that i really am getting close to being 100% happy with it. Bought in jan 2011 and it went about 1800 miles west to Moab Utah on its maiden voyage.