I have no experience with SPEEDCO but over the years many on several RV Forums have praised their service and pricing. Certainly they will be less then any Cummins, Freightliner type center.
However if you want to use a Cummins facility we have had very positive experiences at Cummins Kenly, NC and Cummins Savannah, Ga. and both situations were unplanned but both resolved our problems quickly and fairly price wise.
In Particular Kenly Cummins Atlantic once they knew we needed to be in Washington DC the next day for my oldest brother's funeral at Arlington National Cemetery assigned a tech immediately to our coach and had us underway 3 hours later. When we went to settle up at the service desk the service manager greeted us and THANKED me and my brother for our service and handed me our paperwork marked NO CHARGE. It brought tears to my eyes ! We discussed his decision for a few minutes and he finally agreed we could leave a cash tip for the techs next coffee break.
Sue & Brian Ashworth & Rizzy( adopted Boxer)
2016 Anthem 44A, 2018 GMC Canyon Denali,