Tow vehicle too short of wheelbase???

hookset wrote:
Recently downsized from 39' 5th wheel & one ton diesel dually to a 30' (box-34' inc hitch)trailer and a 2017 Chevy Silverado Tahoe suv. On tow home from dealership & 1st camping trip (100 miles total) I experienced a considerable amount of sway even with a WD hitch and 1 sway bar. Many years ago we started camping with a 30' trailer pulled by a Chevy Blazer - don't remember having this problem. Is it ---

1. Tahoe has too short of a wheelbase (116 inches)
2. Need 2nd sway bar
3. WD hitch not installed correctly
All the above or ????

Could be partly 1 thru 3 and possibly some of the following.

4. Overweight ??? Tahoe's max tow and payload numbers -- Up to 8600 tow capacity and 1700 payload. Keywords being "UP TO". Depending on installed options, not every Tahoe will have same payload. Your's is listed on your tire / loading sticker, located on drivers door post. As you fill up the Tahoe, with people, pets, and cargo, etc, every pound you put in there, takes a pound away from both payload and towing capacity. The weight of your hitch equipment and the tongue weight from the trailer are counted as cargo in the tow vehicle. My trailer is similar in size to yours, and my trailer (with hitch) takes up 11 - 1300 lbs of available payload. It varies because tongue weight is not a constant number. It goes up and down during every trip. Check your loaded tongue weight, add 100 lbs, and that is a ball park of how much payload your trailer is eating.

5. Tahoe's tires ??? Under inflated and / or soft sidewalls. Could be, you're feeling sidewall flexing. Are they passenger or light truck tires?

6. Insufficient tongue weight ??? As others have mentioned, minimum should be ten percent of loaded trailer weight. Higher is better. Average is 12 - 13 percent.

7. Hitch ball height ??? Trailer should tow level to slightly nose down. Nose up can cause sway.

Note on your number 3 ... Things to check (a) weight rating on trunion / spring bars. Are they strong enough for your loaded tongue weight? (b) If they're strong enough, are they restoring enough front axle weight?