Is the shop that's closer than your mechanic, capable and always willing to repair your RV?
From the latest Good Sam Platinum Members Benefits Brochure.....
"TOWING SERVICE
Our 24-hour, 365-days-a-year dispatch center is available with one toll-free call. There are no pre-set mileage or dollar limits. When you call for service, Good Sam Platinum Roadside Assistance pays 100% of the towing fees for the delivery of your vehicle to the nearest professional service center capable and willing to repair your vehicle. However, you must request disablement assistance through
our telephone dispatch center within 24 hours of the disablement. If you make any request for your vehicle to be taken to a location other than the nearest professional service center, including your home, the mileage fee (for the distance in excess of the nearest licensed repair center) will be at your expense.
If you request to be towed to a location other than the nearest professional service center, as described above, you will not be entitled to any additional towing services for the same disablement. A request for a tow to your home would also require additional payment if that distance exceeds the distance to the nearest
professional service center."
The service center must be "professional, capable, and willing".
I would think that if your Ford chassis breaks down, they'll take you to a Ford shop (or dealership) as long as they can fix the problem and agree to do try to do it. If it turns out they can't fix it, that's not your fault, and you can probably call Good Sam and request a new disablement response, since the repair facility wasn't qualified based on their selection criteria.
Should be the same for GM, Mercedes, Cummins, Freightliner, whatever, and so on.
I find that if you can access the internet before you call GSRA, and can find a shop near where you've broken down that can fix your problem, the dispatchers will usually listen to, and approve your suggested destination. Particularly if you call the repair shop first yourself and arrange for the service.
As others have said, it can sometimes depend on the dispatcher, and how well you deal with them. I always try to assess the situation before I call, and try to have the answers ready before the questions are asked. Makes the process go more smoothly. I've never had a problem with a GSRA dispatcher. They always ask if we're in a safe environment and out of harms way, before they begin to discuss the actual disablement.
It can also depend on the tow truck operator. If they know a nearby shop that specializes in your type of RV, they can discuss that with the GSRA dispatcher, and probably take you there if approved.
Good Sam isn't going to stay in business very long if they provide poor service, and cause people problems. There's just too much competition out there now with all the roadside assistance options available to us.
I have been with Good Sam for a long time, and have always been treated well, and had my problems handled efficiently and professionally.