1998 GMC Sonoma Owner's Manual - Page 223

NOTICE: Do not tow with sling-type equipmentor rear bumper valance damagewill occur. Use wheel-lift or car-carrier equipment. Additional ramping may be required for car-carrier equipment. Use safety chains and wheel straps. Towing a vehicle over rough surfaces could damage a vehicle. Damage can occur from vehicle to ground orvehicle to wheel-lift equipment. To help avoid damage, install a towing dolly and raise thevehicle until adequate clearance is obtained between the ground and/or wheel-lift equipment. Do not attach winch cables or J-hooks to suspension components when using car-carrier equipment. Always use T-hooks inserted in the T-hook slots. I 5-11