There may be tell-tale signs of corrosion on steel wheels, brake backing plates and springs. Suspension Heavy loads and corrugated roads can lead to sagging springs. Sagging springs can cause hammering of suspension bump stops and lead to chassis damage. Heavy front-mounted winches make this more likely unless stronger front springs are fitted. Look out for fluid leakage, although a test on a dynamic test rig is the only way to be sure of the shock absorbers' health.
Insurance companies are suspicious of non-standard vehicles.
It is important that the belts be replaced within the recommended interval. Timing belt failure can also be caused by oil leaks from the front of the crankshaft or by the entry of water if the wading plug has not been fitted for water crossings. The engine is generally strong provided that it is well maintained. The oil must be changed regularly or camshafts, valve gear etc. The vehicle is often overloaded and driven fast on bad roads because of its good ride.