My lug nuts are not covered, but there is a silver plastic cap over the hub itself. For that type, there is a slot for a screwdriver blade to pry them off. They are on there tight, and I thought I was going to break something before mine finally came off.
On a previous camper I had the type that covers the hub and the lug nuts. As other suggested, a PIA. I got a miniature crowbar-type tool at Lowe's that worked very well.
2013 Surveyor SP220
2010 Silverado LT 5.3 V8
The world is a great book, of which those who never stir from home
read only a page. - St. Augustine