My previous tow vehicle was an '03 Trailblazer 4wd, I6 with 3.42 gears. The Trailblazer with I6 is a great tow vehicle for a trailer with a GVWR of 4000# or so. Much more than that and it makes for a mediocre towing experience. We towed a 17', 3500# GVWR hybrid for 7 years with the Trailblazer. It was like they were made for each other. Towing the X20E, GVWR of 4750# was OK, but nothing to write home about. we did that for one summer. It towed OK on the flat roads of WI, but no way would I have taken it though mountains or on trips that take more than a couple of hours.
Dry weight is a fictional number. You will never tow at it's dry weight. Adding the options like AC, awning, and other things, the trailer will weigh at least 500# more than the listed dry weight. Look for the shipped weight on the yellow sticker on the side of the trailer. When you are loaded for camping you'll be closer to the GVWR of the trailer than the dry weight. You'll be lucky to keep the actual towing weight below 5500#.
Without knowing all the specs of your TB I'll say right off the bat that you will most likely be over capacity, and even if you're not, you'll hate the towing experience with that kind of weight.
A couple of things to look at, first your owners manual has a towing chart in it. It lists things like gears and options like EXT. Look at the chart in your glove box, it has the RPO code list.
Look for one of the following:
GU6 = 3.42 RATIO
GT4 = 3.73 RATIO
GT5 = 4.10 RATIO
This will help determine your true towing capacity.
Another thing to consider is your payload. SUVs typically have a low payload. Mine was something along the lines of 1100#. You'll find this number on the weight sticker in the driver's door jamb. Let's say your loaded trailer is 5500#. Assuming a 13% tongue weight of 715# and 100# for your hitch, that leaves 385# of remaining cargo capacity. Subtract the weight of your wife and any stuff in your truck. Not much room is there?
Any crew cab 1/2 ton truck with a V8 will tow that trailer like a dream. Your Trailblazer will be marginal at best.
Originally Posted by dougfir1
IMHO these V6 engines just are not built for much towing capacity.
The Trailblazer has an I6, not a V6. Yes, the 5.3 V8 is better for towing, but the I6 was built as a truck engine from the ground up and is nothing like the V6s made for cars but re-purposed for SUVs. It's I6 is an excellent engine, the later models made 291HP and 277 lb·ft. The issue with the GMT360/370 series of trucks isn't the I6 itself, its the torque management, gearing, and overall platform that was built for better MPGs.