Ron, two 1000 gallon tanks sold here last spring with fresh paint and decals, new USDOT cert number (lasts 5 years or so, then must be redone vs ASME plate which is good as long as it's there, by our state rules at least) usable running gear and tires and valves and water tank.  No hoses on tanks here.  Brought $850 each. 

Two days later three similar tanks sold on farm sale.  Needed paint, decals, valves, water tanks, tires were from good to bad.  At least one had no ASME plate.  Brought from $600 to $1000.  Manager who sold the two on the auction two days previous said "that's the last time I'll sell a tank that's in good condition.

Lots of 1000's are going onto double running gear here.  KS has some sort of stupid problem with simply pulling two in tandem like the rest of the world can.