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1 ........... ???

2 - Try your dealer and/or talk to a Isuzu rep to see if the wheels can be replaced ........ although I have read the replacement wheels are no better .......
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3 - My guess is the OEM shock absorbers are shot ....... this is not uncommon .........
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No one will mistake a VX for a barcalounger, but the ride should not be that bad ...... maybe it is the color ? ......... my 2000 Firefox had four shot shock absorbers at 35K - three were totally shot and one only slightly better ........ four replacement KYB Monomax shock absorbers cost under $200 shipped from TireRack ..... these are not 'high end' - but work well and you should be satisfied ......