Just wanted to post an update for anyone seeking the same information. The trams at the D gates in Las Vegas were a breeze. Thursday was a little more crowded than Sunday but we just waited for the next tram and were first in line. Security was a little slow as there were a ton of people in wheelchairs going through but not too bad. The people who helped with the aisle chair were really helpful, apparently they are a company LAS outsources to. The only negative part of our LAS experience was an hour delay on a very hot aircraft while they fixed the radio and when we finally got to EUG we didn't realize that one of my husband's mud/side guards was missing. I will try to contact Allegiant but am not hopeful so I will just have to purchase a new one.