How about Yakima cross bars/towers on the DC roof and leave the topper alone? The no-drill Q-Towers have proven themselves on gutterless roofs for years.
1997 FZJ80, White, Locked, deflared, 5.29'd, 4-5" lift, Fox's, DC shafts F/R, 35" AT's, Metal Tech front bumper w/ winch, custom tube rear bumper, SROR sliders, IPOR skid, Custom exhaust, Snorkel, Eezi-Awn 1600, Mark's Speedo Box.
2008 Subaru WRX Wagon, mods and lifted on 27's
2001 Honda XR400 with goodies