Double wide sleeping pad?

I've got some heavy, self-inflating pads (for camping and boating) with Velcro on the edges. About three strips 4 inches long each. It works well. Maybe you could add that to your pads with fabric cement.

I used the straps for a pair of thermarests 25 years ago and the Velcro works better.

Z Packs recommends these:

http://zpacks.com/materials.shtml#velcro

I would love to hear more about your quilt? What temp rating and have you pushed it near its limit?

Thanks for the insight, I'll give those Velcro strips a try I think.

As for the zpacks double quilt: my wife and I haven't pushed it to its lower limits yet. It's a 20 degree 6' model. My wife is 5'6" and I'm 6'1" and it works well for us. We have had it down to near freezing and we were comfortable then. I tend to sleep warm and the misses likes that when its cold ;)
Thanks,
James

Lots of UK family camping brands have brought out some double wide SI pads in the last few years. They're often on the heavy side but if you're looking at "car camping" with it then that's not a problem.
Examples come from
Vango: https://www.vango.co.uk/sleep-mats/adventure-double-/-3cm.html
and Gelert: http://www.gelert.com/products/xpedition_double_mattress

I was looking for an alternative to attaching mats and I struggled to find anything light without going for CCF. I believe multimat do some sort of CCF designed to be a sort of footprint of a 2 man tent as overall insulation which could work but as you said, CCF isn't preferable to most.

At least 4 manufacturers offer double wide inflatable pads:

KELTY double wide Basecamp pad

ALPS MOUNTAINEERING lightweight series Double

OUTBOUND EQUIPMENT doublewide Rest

BIG AGNES Hinman double Wide

Exped has a "strap" solution but with a way to keep the mats closer together :
http://www.youtube.com/watch?v=zqisAhf4rP8
(easy to replicate)

“What are some light weight option for double wide sleeping pads? “

I used the Thermarest Universal Couple Kit. However, I see today it has buckles. Mine does not. Mine is like a ribbon sewn in the center to form a figure 8. I have two of these. Then the each pad would go in its corresponding figure-8 loop; one at the foot end; the other at the head end. And it works great.

But anyway, lately I’ve gotten lazy. I use a 1oz 14”x14” cupboard lining material. It is very grabby. We center our mats on that square and it holds pretty good on level ground.

-Barry