if the axles are torsion type the condition may warrant consideration when you get it home but should not be a consideration to bring it home.
The condition of that type axle is determined but inspection the angle the trailing arm, from the axle tube to the spindle, has. new axles will have a downward angle from the axle tube to the spindle. As the axle ages that angle can become an upward angle, replacement time.
I would be far more interested in the date code and manufacture of the tires. Tread condition may give you a false indication if the tires are in fact OLD.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles