That is the right kind to get, Donna. They also have them at Walmart, don't know the current price or how the actual quality compares. I have been using one of these for five years with very good results. The extra 25' will have some resistance factor, but your Scamp
won't have all the appliances of behemoth RV's.
I have seen many people try to use the skinny little extension cords used for power tools. They can really heat up running several items in an RV. That is a good price you found on the 30-amp cord. It will do exactly what you have in mind, too.