Tires.....

[Tedsoldbus]

Jim is correct about in that you will almost never have full black and grey tanks. I only had it once. Coming from Alaska to the US in May. We could get water at places, but all dump stations were still frozen or would not let us dump as their tanks or the pipes to them would freeze (according to them). So almost to Washington state before we could dump - we had full tanks.
Like Jim said...
How often is that going to happen.