[mikeyouse]

Tahoe could be trouble with a camper in tow, but the distance to Yosemite is only 2/3rds of the published range for the Model X -- I'd be shocked if there wasn't sufficient range to get there. Curb weight for the X is ~5,400lbs, call it 5,500lbs with driver.. Adding 5 passengers averaging 100lbs (family of 6) and 200lbs of gear would only add ~13% to the vehicles weight which would only minimally impact range since drag is a much bigger determinant for highway trips.

I found a nifty little site that takes into account elevation / vehicle weight, etc. for the actual route. Looking at the Model S, base range on the road to Yosemite with normal driving is 240 miles. Adding 700lbs to the car results in a range of 210 miles. So a 40% increase in vehicle weight only corresponds to a 12.5% decrease in range. This can be partially mitigated by driving at a "3/10" instead of a "5/10" in terms of range-extending, which results in about 225 miles of range with the same weight.

http://www.jurassictest.ch/GR/