My wife and I have had both, and we really prefer rear baths. I know they have a bad rap and have become blamed for frame separation. This is too bad. I inspected a 70 something mid-bath Sovereign
31' a couple months ago, and found significant frame separation.
I am convinced that Inland Andy has it right. Frame separation can be caused by a combination of factors, and the two biggest culprits are corrosion of the frame bolts caused by water penetration and vibration caused by out-of-balance running gear.