Apprehensive at first. We can't get in and out of LA basin without passing the dreaded-white knuckle Grapevine-Tejon (14 miles - 6 degree grade), Cajon Pass (also 14 miles - 6 degrees) and Conejo.
In a Carpenteria trip, our first, we avoided Conejo uphill by taking the Malibu-I 10 route.
But can't with the Yosemite trip. Oh yeah, and snowed out.
Took the Grapevine-Tejon on a wing and a prayer. A pleasant surprise. Both downhill and uphill, the 4runner is in full control and way up with power to spare (on 3,400 rpm tops with no sign of over exertion).
I'm pulling a Coleman 17FQ (no kidding, you can't make this up) rated at 3,650 pounds and nearing 5,000 pounds loaded.
Cajon pass next - this time with more confidence on the way to North Rim Grand Canyon.