There is huge vacuum on the trailer roof at highway speeds which can pull the roofing material from the sheathing. EPDM roofing material is bonded to the sheathing with contact cement. Wrinkles can appear when the material sticks before it's pulled taut--just like when taping a package for shipping. You can assume that both sides are bonded well and are secure.
Bubbles are another case. If the roofing has started to pull away, more could do so at highway speeds. Keep a close eye on it and if it grows, get it fixed.
__________________
Larry
"Everybody's RV is not like your RV."
"Always take pictures with the button on the right."
"Always bypass the water heater before opening the low-point drains."
Sticks and Bricks: Raleigh, NC
2008 Cherokee 38P: at Ivor, VA permanently
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