Passionbob the red rover plant kevin has come from me and I got mine from walter andersens and the plant was grown by monterey bay nursery. I think they use tissue cultures from agristarts.
The fruits are round and have thicker shell than fredrick. Taste basically the same. The red rovers dont get sun damaged as easily as fredricks.
Heres the description from CRFG which matches the vine I have.
"Red Rover
Originated in Lincoln Acres, Calif. by Patrick Worley. Kahuna X Brazilian Golden. Medium to large, roundish fruit. Rind an attractive clear red color. Sweet, notably rich flavor with tart overtones,. Good for eating out of hand or juicing. Vine very vigorous, compact and self-fertile."