6 Adults with 6 Bags and 6 carry ons on Uber?
The Guru Take
May be tight. UberXL or UberSUV
UberSUV and UberXL both can carry up to 6 passengers; however, you may have trouble fitting all the bags and carry-ons. You do have acceses to the trunk/cargo space, but depending on how much luggage, this could be tight.
Some UberXL UberSUV vehicles larger than others. If you get connected with an Cadillac Escalade or Suburban, there is actually space for 7 people, where a seat can be used for luggage. You may have better luck with UberSUV, the more expensive luxury service, as they tend to have larger cars.
Here is an article regarding luggage on rideshares: How much luggage can I bring in my Uber/Lyft?