This is a rather complexes problem as you may need a program that can handle three dimensional "items" and I don't think the "limited" excel solver is up to it.
If all the items have the same height then the problem will become a two dimensional one and much easier to solve as the program only have to consider "length" and "width" when solving the problem. Still it's a fairly complicated problem but at least it is a linear one and the freebie "OpenSolver" should be able to tackle it I guess.
You best option I think is to buy a third party program for loading containers and trucks unless you can write or find a suitable algorithm that you can add to an excel spread sheet.
Alf
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