If you leave from Long Valley Campground, crossing the Kern River could be treacherous. If you cross north at the PCT bridge, you will have a longer trip to reach Rockhouse Peak. Crossing west from Rockhouse Meadow the trail is no longer maintained and easy to lose(Rattlesnake or Woodpecker Trail).
Approaching from the west from Manter Meadow,the road to Big Meadow(Cherry Hill Rd.) may not be open until later in the season.
Tom, I think the crossing below LV Campground would be terrible, at least it's looked that way every time I've looked at it. I hate to think of it now.