I think any track would have to go forward of any PHT Bed. We were really looking for a minimalist approach to the curtain. My wife made it of a light weight durable fabric, and with the velcro we can modify connection points whenever we need to. Our two part curtain ends up taking up less room than a pair of socks.
Greg in Austin
2008 Ford 6.0PSD EB/E-PH SMB 4X4 Aluminess f/r bumpers (13.5mpg avg, 15mpg hwy) 52k miles [Texas McBeast]
2006 Toyota Prius (48 to 68 mpg) 120k miles [Penelope]
2013 Jeep Wrangler Unlimited Rubicon (15 to 18 mpg) [Johnnie]
2012 Mitsubishi MiEV (no gas required) ($.50/day in electricity) [Evie]