you need to post what they want to charge for all of this.
a Prodigy P2 brake controller costs under $100 and can be easily installed by you. there may be a plug-n-play harness that will cost about $10.
an Equalizer WDH with built-in sway control can be bought, with free shipping, for less than $450. easily installed by someone with a minimum of handiness.
a 3rd party extended warranty is usually a waste of money. PLEASE read the fine print to find out what they WON'T cover. and how much are they charging for it?
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC