I will bring my BBQ attachment for my camp chef grill. The cooking surface is 16" deep x 24" wide x 8" tall, which should be good for a few tri-tips. My only concern would be making sure the lid will close, but I suppose we can cut the tri tips down if we have to.
Also, propane might be a concern. I'm only bring a 10lb tank, and I'm not even sure how full it is (I think we used 1/4 - 1/2 of it in Death Valley). I'm confident there's enough to cook the 8 lbs of bacon on Saturday morning, but cooking three large tri-tips could use a lot of propane and I'm not confident that there's enough in that tank for both tasks. Will there be some back-up propane just in case?