I have a 2002 Olds Bravada, which was the AWD version of the Trailblazer / Envoy. At the time with the MaxTow options package that included self-leveling air suspension, high-cap water pump, and tranny cooler it was rated to tow 6000 max.
In addition to my fishing boats, I have a 22 foot Wellcraft express cruiser on a dual axle trailer with surge breaks. With a half load of fuel, and alregularlr gear, this boat/trailer weighs just over 4500.
It tows very well behind the Bravada. Obviously, you don’t move something this heavy without feeling it, but there is enough power and more importantly enough cooling capacity that I don’t boil the engine even when towing in 90 degree heat with 4 passengers and the A/C on.
Bottom line is on any boat/trailer combination over 2000 pounds, I think you’re crazy NOT to have brakes on the trailer. Brakes on a truck are engineered to stop the truck. Beyond that, all bets are off.
A couple thoughts to you questions:
– Tranny – when towing anything of significant weight, most owner’s manuals recommend that you shift into drive rather than overdrive overdirve setting. This prevents the tranny from “hunting” and constantly dropping down a gear and then shifting back up to overdrive because there isn’t quite enough power to maintain speed in the overdrive gear.
– All “towing packages” are not created equal. Some towing packages only add a plug for the tail lights and that’s it. Make sure you know what you’re getting.
– Towing is as much about cooling capacity as it is about power. For heavy towing, you need to pump more water and you need to be able to cool your transmission. That’s why it is very good to get a package that includes a tranny cooler and a high capacity water pump. IMO, it’s totally worth paying extra for these.
– There is no significant difference in power between the two vehicles you mention.
– Suspension depends not as much on the design, but on what springs are set up for. I LOVE my self leveling suspension on the Bravada, but this may/may not be available on the models you’re looking at.
Grouse