Welcome to JOF
I agree, I feel confident that your TV will be more then capable of towing the ZX 161.
In case you don't have them, here are the published specifications for the 2010 Octane ZX 161:
Unloaded Vehicle Weight (lbs.) 4,065
Dry Hitch Weight (lbs.) 625
Gross Vehicle Weight (lbs.) 7,000
Cargo Carrying Capacity (lbs.) 2,935
Exterior Length 20' 7"
Exterior Height with A/C 127"
Interior Height (living area) 81"
Cargo area length 8'-0"
Fresh Water Capacity (gals.) includes water heater 37
Gray Wastewater Capacity (gals.) 28
Toilet/Black Wastewater Capacity (gals) 32.5
The important thing about a tow hauler is getting the load balanced correctly so that your "loaded" tongue weight is 13% to 15% of the TH's "loaded" weight, confirming this may take a visit to your local CAT scale.
CAT Scale "how-to": http://www.jaycoowners.com/forums/f37/how-to-weigh-your-tv-tt-3871.html
Yes, a properly sized/adjusted WDH (weight distribution hitch) is a must. Since you will be towing with the TH under loaded conditions most of the time, the WDH will have to be re-adjusted once you have both your TV and TH under loaded conditions.
Feel free to report back and ask for any clarifications after picking up your TH.
Hope this helps.