Roof air bubbles

Sounds like problems looking for a new owner.
Price in a whole new roof, including underlayment then make your decision.

thank you for that. Just out of curiosity. what is the construction method that makes it ok less than 6 inches from the sides?

The sides being loose is not unusual (up to 6"). Anywhere else is. That area 5' back from the front is unusual. If you cut a slit to determine if water intrusion has taken place, you can let it dry out (if needed), squirt in adhesive, apply pressure (board with a weight on top), let the adhesive dry and then apply a strip of Eternabond on the slit you cut. The Eternabond will never come up.

Or, unless you really have a great deal on that trailer, find a different one the wife REALLY likes.

JDC1, appreciate the response. The more reading i do on this topic the more common i find it is. Seems air getting in a seal can also cause this. As well as a poor install job at the time of the roof install. do you think its worth cutting into or wait to see if they grow or is just the way the roof is? Also, about 5 feet back from the front, in 4-6" from the sides on both sides, the material that they bring around the sides under the roof seems to have let go slightly. I can push it down 1/4 to 1/2" where you can tell it meets a firm surface it seems to be intended to be adhered to. Any thoughts on that?

There's only one real way to find out what is going on. Yep. You gotta cut a slit to see if any moisture got in there. That slit is easily repaired with Eternabond tape (after the affected area dries out, of course).

That’s too many bubbles and they are too big IMO. Look elsewhere or deduct a pro repair and make an offer.