I own 2 1.5" width 5.11 TDU belts.
They hold up well but they are not the "gunbelt" style.
For thick-lined belts, I'd check www.thebeltman.net
and some of the custom shops; Milt Sparks, Mitch Rosen, Greg Kramer, Don Hume, Ken Null, Galco, Bulman Gunleather, El Paso Saddlery, Tex Shoemaker.
Larger firms like Blackhawk, 5.11 Tactical, Unkle Mike's, Safariland also have well made, sturdy gun-belts.
www.blackhawk.com www.uscav.com www.galls.com www.qmuniforms.com www.policeHQ.com