Re: XXL covers & diapers?
If the ToddleEase fit, I would see about having a single layer suedecloth 'diaper' made to go under the ToddleEase to make the whole thing stay dry. For covers, do you use wool at all? The Disana 4-5yo size fit my 6yo well and is what we use for nights. You could also have fleece or wool interlock soakers made to fit.
If you sew, you could try making a fleece soaker with Katrina's pattern.
Cristina, Mama to Michael 03-16-06 , Nathan 01-16-11, and an angel 01-20-09
Go with your gut, follow your heart.