I do have a 3U SKB that is similar to that too, which is great as the fat handle helps carrying it with my weighty preamps. Most of the flight cases seem to have slim handles which are unpleasant to carry with heavy stuff in. Currently I use a 4U SKB roto shallow rack with a 1U power amp.
I would prefer to move the 1U power amp into the 3U rack with my bass power supply and F1-x preamp for a lighter rack. Then use my 2U Crown XLS amp into fat handled 5U, Ideally, shallow rack with two pre-amps and a bass psu. So the fat handle will help with carrying the weight.