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2019 Promaster 3500 Silver high top 159"
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I used #2 for all the high current wires and #4 or 6 for everything else. I also had issues with I/r drops across lugs so I filled them with solder after crimping and I torqued down the bolts to minimize the voltage drop.

I also rearranged the topology to minimize number of lugs in the inverter loop. In particular by running a separate #2 return directly between the battery and the inverter. I don't run heavy currents through a bus bar preferring to double up the lugs on a single stud.

10 minutes at 150 amps and the wires get warm, but not hot. I measured ~.5v drop @150a, or about 75 watts dissipated in the inverter loop. #2 might be a little light for 250a over an hour dissipating 120watts...
 
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