Is this a summer trip? Your kit list could be overkill! The Rhinogs are lovely. I wish I was coming with you. There are trees you can get into lower down on both sides of the ridge if the weather turns against you. In some places, the vegetation restricts pitching options. Could you both get into the Gatewood if you only had room for one erection. (Sorry, I've been reading that other thread.)
Memories are flooding back. Falling over a rock in the rain and thinking I'd had a lucky escape only for my rucksack to fall forward and smash my head into the rock. Next day, at the old youth hostel, repeatedly throwing a small tree for a huge dog to retrieve and rupturing a muscle in my abdomen as a result. Arriving at Barmouth with a monstrous hangover, watching entrants head out to the start of the Three Peaks Yacht Race, restored by fish and chips, before heading up to beautiful Llyn Hywel and finding only one good pitch. Dossing in a three sided forestry shed and hearing a vehicle coming down the track. It never arrived so I wasn't thrown out. Eventually I realised that the vehicle had been three miles away on the road and the stillness of the night air had let the sound carry. But mainly great times. Many scrambles, particularly in the northern section. The joy of precise navigation in a mildly testing environment. Endless choices for how to spend the day.
The Rhinogs are superb. Please let us know how you get on.