What time of day are you traveling through? What day of the week?
I think they are about to switch sides - they've been working on the eastbound side and it's been down to one lane for the "expressway" and one lane for the "local traffic". The westbound was just split like that this past weekend (I believe).
If you hit it on the weekdays between 7-9 a.m. or 3-6 p.m., it can be pretty slow. I've done it with my C at those times, but I wouldn't with a trailer. Reason: people are idiots and tend to sit their cars between the TV and the TT/5er and then expect YOU to find a way to get them out from between them. That stretch is down to one lane in places with no place to move out of the way when those idiots come up beside you.
If you're going later in the evening or earlier in the morning, then you should be OK. Midday can be hit or miss. HOWEVER: because the westbound has just been changed to provide the expressway lane, folks will be messed up and chance of accidents is much greater. It might be worth it to go around.
An option for detour (westbound):
Take Watt Ave exit and go south to El Camino, turn right on El Camino and follow it all the way to the I-5 connection. This will entail lots of stop lights, but you can bypass I-80 construction completely. Won't save time, but you won't have to worry about folks merging on you.