Trucks would not be able to enter I-64 westbound at 4th View
The problem with this is that you have two local truck routes (Oceanview Ave and Tidewater Dr) connecting to I-64 at that interchange. 4th View is also far enough away from the HRBT to where any widening of I-64 over Willoughby Spit would basically meld the two existing bridges together, making it easy for trucks getting on there to get into the proper tunnel.
It should be noted that existing study proposals, which also convert the existing eastbound tube for westbound traffic, still allow trucks to get on at 4th View.
As for the issue of number of lanes and traffic congestion...believe it or not, there are actually more eastbound drivers in the morning than westbound drivers in the evening (3655 vs 3380 per 2011 volumes). The reason why there's more congestion westbound is because of a combination of the lower/narrower westbound tunnel, and stopping overheight trucks to turn them around impacts westbound traffic much more than eastbound. A 3 lane eastbound tunnel would result in 2040 backups similar to today's backups...which is partially why VDOT dropped the "6-lane" options.
Wonder if Hampton Roads-area motorists are willing to start paying tolls to a PPTA concession holder for the next 60 or 70 years to fund a new tube?
If the reaction to Downtown/Midtown Tunnel tolls is any indication, the answer is "no".