The Burley I bought came with a rear skewer but has a solid axle and nuts. Every time I go someplace I usually remove both wheels so I can minimize the width of the bike. I use a Yakima hitch rack and clamp the TT.
I am thinking of going back to the skewer for ease of use, with maybe an internal cam type for maximum clamping force. This is a 1994 model with a 6 speed Suntour Accushift drivetrain. There is room for a 7 speed but the BarCon won't work well with it.
What is your experence of axle durability? Have you had issues with hollow axles on tandems?