A bit over 1/3 of my ships are trading ships(4 of 11 in total, 4 of them are military, i play for 2 years and i design my ships for longevity and necessity, i still use my first proper ship, and that was 25-26 months ago) and all of them use the proper of a cargo ship, the cargo is ship bound and not container bound, my largest one has aprox 370k blocks(185m long), 80k block capacity(the new cargo system probably will be above 1:20 ratio), and it also has around 2.4 warp ratio(so it is quick-ish) and something like 6.8M shields.
I also have a bit smaller(155m long) trading ship, but much higher speed at around 3.2-3.6 warp ratio, 1.1-1.7T/M,4-5M shields, and around 270k blocks, and also have 2 small size cargo ships at 56 and 76m long but they don't have much of proper shields, being the smallest one 4.7k blocks and 35k shields and the other around 12k blocks 120k shields.