That "thing" would depend on the power supplied by the source.
"If" the two 30-Amp outlets were fromdifferent legs of the 220-V source, it would furnish suficient power.
If they were from the same 30-A source, you'd get only 30 amps.
I've never seen anything like this.
2005 Georgetown 342DS XL, Full Banks Package
2005 Liberty Renegade 4X Toad
1989 Wrangler Sahara Toad
1984 19.5' Beachcraft i/o 5.o liter, 4-bbl (and you thought your Moho sucked gas!)
D/W Carole and Maggie the Teacup Lab (Black Chihuahua)