Front side airbags and keyless remote become optional instead of standard for 2004 editions of Isuzu's flagship SUV, which added a shorter-wheelbase version midyear. Based on General Motors' midsize SUVs, Ascender is closely related to the GMC Envoy. Ascender originally came only in an extended-length version with 3-row, 7-passenger seating; added midyear was a regular-length version with 2-row, 5-passenger seating. Extendeds offer 6-cyl or V8 power, regulars only the 6 cyl. Both come with a 4-speed automatic transmission. Ascender is available with rear-wheel drive or 4WD that can be left engaged on dry pavement and includes low-range gearing. Antilock 4-wheel disc brakes are standard. Curtain side airbags are not offered. OnStar assistance and power-adjustable pedals are optional; traction control is available with 2WD. Ascender comes with Isuzu's 3-year/50,000-mile bumper-to-bumper warranty and 7-year/75,000-mile powertrain warranty vs. GM's 3-year/36,000-mile coverage. Maximum towing capacity is 7200 lb. Ascender's performance and accommodations mimic those of similarly equipped Envoys.