Didn't know that FR offered inverters on any of their rigs, however, there are so many different types of TVs, VCRs, DVDs etc out there that answering your question without more information is impossible.
You need to find out what the power draw of the TV/DVD/VCR, etc that you intend to run off of an inverter is and determine what you can do with a 450W inverter.
In my own experience I would guess that 450W is a bit smallish but it may work depending on the TV.
The other factor is the size of the battery bank. Inverter size should be matched to the battery bank which it will draw from.
For excellent information regarding 12V RV systems, inverters, charging, solar and more go to: http://www.ccis.com/home/mnemeth/12volt/12volt.htm
This site is my "bible" for all things RV electrical and a real good source of answers for your questions.