Michelin tires are among the best, and there are not that many other brand choices in that particular size. Small sidewall surface cracks are part of aging and may not necessarily be a problem. Your tires are not that old, and I doubt you have worn the tread down to the minimum. You should go to a reputable truck tire dealer and have your tires inspected-preferably a Michelin dealer so they are not otherwise motivated to sell you new tires.
My 2005 Dolphin with the same tires has some small sidewall cracks starting. I recommend treating with a tire UV protector and use sun covers whenever possible and regular inspections. Those tires should last 7 years (Michelin says up to 10 in some cases) with good care.
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2017 Coachmen Orion, Ford Transit 3.7L: previous
'09 Pleasure Way Lexor, '05 NRV Dolphin 5342
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