Traveling with a full water tank

Hmmmmmm, a lot depends on the manufactur. My old Alpenlite had a 100 gallon fresh tank. We usually traveled cross country with it at least 1/2 to 3/4 full. We traveled for a couple hours local with it totally full and never ever had a problem with any of our tanks. Now with our Montana the tanks appear to be fairly weak. We have read where they will burst and drop too. In fact I over filled my galley tank it it burst to where they had to replace it. The fresh tank is only 60 gal I think and we still travel with it 1/4-1/2 filled and so far so good on it.....Oh and my extended warranty did replace my galley tank..