The Berkshire XL, Berkshire, Charleston, Forester, FR3, Georgetown XL, Georgetown, Legacy SR 340, Solera, and Sunseaker are all motorhome models manufactured by Forest River RV. Each of the models has variants based on different floorplans, exterior and interior features.
For instance, the Berkshire has three variants: 34QS, 38A and 38RB. They all run on the Cummins ISB 340 horsepower engine, but the 34QS has a shorter exterior length than the 38A and 38RB. The 38A has a higher fresh water carrying capacity than the other two variants.
Some models have only standard features while other have options. In FR3 motorhomes, everything is standard. The Charleston has a Bose sound bar, stainless steel dishwasher and a booth dinette as living, dining or gallery options.