Gonti GP4000 are folding tyres and you can almost talk them onto the rim. They were great tyres and resistant too, to a certain point at which they just started to fall apart very rapidly. They are expensive though and had been got in a sale, so just replaced with regular Ultragatorskins.
I've always been lucky with Ultragatorskins. They still need assistance of a lever to get them on and off usually, but just the one.
As I've posted before, Marathon Plus x32c fell apart on my tour but Ultragatorskin x28c didn't. My tourer now has Conti Touring Plus as Top Contacts just seemed a bit expensive - and I wasn't planning on cycling over the Andes or something at any point soon. Then I might consider them. I'd never use Marathon Plus again. I've proved to myself that they are not bomb proof so don't think why I should have to put myself through hauling nearly a 2 kilos of heavy, ride-deadening rubber around.
The rolling resistance in my experience is pretty low, however getting them up to speed is quite a chore and I found they really tired me out when I was commuting on a bike with them.