Chevy S10 and Ultra Lite Trailers.

I have an 03 S-10 ZR2 with the 4.3 and a 5 speed manual. Good little motor and pretty powerful for what it is. All that said, I think that would be all it would want and maybe more. Merging with traffic will be a challenge, and hills will be slow but of course that can be managed.

You won't know for sure until you do it. So many unknown variables in your scenario. This is also kind of a personal thing. Your biggest potential issue is cargo capacity. You will be close to your max with nothing in the truck.

I tow a 4600# trailer (dry weight) with a 2013 Ford F-150 (tow package, V8, 8100# towing limit, WD, Prodigy 2 BC) and I would prefer more truck but that's just me. Mine does a great job until I hit the hills. Especially going down. But that's just me and my comfort zone. I see people towing more than you want to with less than you have all the time.

I'd say yes, if you manage your expectations. I used to tow a 21' ultralight (3100 lbs dry, 4400 GVWR) with a 4 liter Ford Aerostar that was 40 hp shy of your 4300 Vortec and I felt it did fine. It would pull the 6% Cascade passes at 45, and easily maintained 60 on the flats with overdrive locked out. I also used to own an older full size 1500 with the 160 hp pre-Vortec V6, and flat-towed a Jeep CJ7 from Helena, Montana to Seattle. Again, not with blazing speed, but I could go at least 50 on every hill, including McDonald Pass over the Continental Divide. My point is that while your truck won't pull the trailer with blazing speed and acceleration like a brand new 1500 series pickup with 350 hp, it will do the job. The Vortec 4300 was a strong, solid engine for its day.

I towed a 25ft Award TT. 3800lb, 5000lb loaded trailer with a 95 Explorer 4dr with the 4.0L V-6. It performed decent here in the flat Midwest. Handled great with decent power.
This was our first time RV’ing with a TT. So I only had a WD hitch with a friction sway bar and cheap brake controller. I never had any stability issues, but an even better WD hitch with built in sway control would’ve been better along with a better brake controller.

With that we need more info on your truck. Reg cab, extended cab, long bed, short bed, which V-6, factory tow pkg, or not as well as gear ratio.

AZMike48 wrote:
I have a 2003 Chevy S10 with a 6cyl engine and automatic transmission. Will it be capable of towing an Ultra Lite trailer with a dry weight of 3327 lbs or even 4200 lbs dry weight?

If it's the 4.3 Vortec v-6, maybe.

If it's not, NO way.

Just saying v-6 and no other vehicle specs, isn't enough information to help you.
Plus using fictional "dry" weights is the #1 Newbie mistake.

It might pull it, but the S10's payload will be nearly all used up by the tongue weight of the trailer.

Had an S10 blazer with the 4.3. Towed a small utility trailer every now and then, but would never consider using it for towing anything more than that.

Towed a 3500# gross weight trailer with an Envoy. The Envoys engine was much stronger than the blazer. Never a problem, but it was pretty much the heaviest is want to go.

I will put this out there.

my 2004 Ram 1500, 2 door short bed.... V6 (3.7L) 5 speed was rated at 3,000 pounds for towing.

and it had a very hard time with a 7 foot by 20 foot camper.. at 10 feet tall..

and it was 3,100 pounds... Empty.

had trouble with hills.. and hated semi- trailers passing..

I drove one for a while and I just don't think it has the torque to do it.
Towing with an under sized vehicle is one of those things that's so miserable that you'll never make that mistake again.

I had an S-10. Great, reliable truck. But, it felt light to me. I don't know what the sticker in your door says but, I would be skeered to push it with the S-10.