Well,,, It looks like you need to correct your model number or something.. I don't find a 28BH listed. I do see a XLT 285BH.
Maybe when you post correct model number someone that has one will give you an answer. I still don't think it will be "exactly" , but close.
Most likely, your black tank in in the front, up high, then the shower, bath sink tank low and somewhat under the black tank, then the kitchen sink tank, and then the fresh water tank right over the axles.