Bought my Kodiak and pulled it a hundred miles home, the first thing I did was get on top, and yes all four corners needed sealing and one spot by sky lite Over main bed, get a tube of sealer, I use Location clear silicone water proof, clean spots with some type, using a tooth brush if it's small like a Crack dry fill, then have a cup of water get finger damp and press sealer deeper into crack, not touch roof around seal, or let it dry then go over sealer again a little bigger than first time, my roof has a three inch seal all around edges, factory uses a flexible air pressure caulking guns, and sometime places does stick, so check for lose caulking, , the package that Location comes in will tell you about repairing, or removal of old caulk.
Hope this helps, a leak is No good and damages what ever it touches.
Djames
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