To add on to QS's comments, I'd suggest Consultation Lake as your campsite rather than Trail Camp. The marmots see Trail Camp as a smorgasbord and tend to leave Consultation Lake alone. QS and I camped at CL last week and left our tents up and zipped with gear inside on summit day. When we returned there was no indication of marmot activity, just mice. You'd be 300 feet below Trail Camp, but the difference in the camping experience is well worth it.
As to bears, I've read that they've been seen as high as Trail Camp at times, but that would appear to be a very rare thing. Too many goodies at the Portal. It's been a long time since I've read about a bear encounter on the MMWT higher than 10K'.
