Not sure why there are so many poor responses to your questions.

1- a 3 person tent is good for 2 people. Or a 4 person tent is even better.
I say this because the gear will be carried by truck, so you can use a bigger tent without the pain of having to carry it.
A 2 person tent is cozy to say the least. 2 people can fit, but they will typically be very cramped.

2- Contact the company about clothes washing. You can just wash clothing and hang dry in the evening if needed.

3- i use clean clothing each day. Salt, stink, and sweat is no appealing to me.

4- sleeping bag, sleep pad, maybe inflatable pillow if you want one.

5- bring tools and clothing for the day with you on the bike.

6- pack clothes in gallon ziploc bags then toss wm in your duffel bag. It keeps everything dry and easy to access. It keeps the funk away from the clean too.