If you have free roadside through USAA, check with them and see how they handle the RV.
If they are similar to AAA, then go with Good Sam or Coachnet. If they are similar to GS/CN, then go with AAA. That way you'll get both styles for one cost.
Coachnet and Good Sam are the major players for their style. Good Sam does appear to have more issues with their telephone operators. Coachnet's reputation is better for the most part. But Coachnet is different in some areas - so check into that. Lots of old threads comparing the two.
Any service will take longer than if you change the tire yourself. And if you're in a safe location (e.g., not on the side of the freeway), it can take even longer.
CN/GS will also send out a mobile tech before they send a tow truck. This can be good as you can get on the road quicker if they can fix it where you're stopped. However, it can slow things down if it's something a mobile tech can't fix. AAA will just send a tow truck.