With multiple output plugs perhaps limited to 15-20A each it’s not clear how it could be adapted for a 30A RV. I was wondering about the 110V and 220V labels since the US standard is 120V and 240V. Apparently the 220V is for 3 wire applications and not the 120/240V 4 wire 50A RV power.
And Almot’s link shows 50Hz not 60Hz and 110V +/- 5%. That’s down to 104.5V. The 5000VA/220V=22.7A and apparently 22.7A is the maximum 110V limit. Not sure what the “Delay” is used for. Red flags are up for me until I learn more as it doesn’t appear to be for US power or RVs.