Pard........
Plumper is a difficult condition to define.......
I guess yes, It seems to me that they are plumper at serving time, If I boil those dogs and brats before grilling, in water.......
I don't see the gain in boiling them in beer, although lots of folks do................
I leave them on the grill only as long as it takes to get some grill marks........
They are really boiled......Way tastier..........
Be very cautious with the boiling..
If you boil them so hard that you have a fat scum on the water, you've blown it, boiled them too much.......
That scum on your boiling water is flavor lost...........
To Paraphrase a Popular tune............
"From the day I left Milwaukee, Pittsburg and Port O' Prince............."
I see no gain in beer instead of water.............Water seems to work fine.........