Hello Dusty and all.
Yes. In my view the new Consumer Rights Act 2015 (CRA2015) has combined three key pieces of consumer legislation, it has clarified and strengthened your consumer rights.
I have not seen the actual act of parliament wording, but I have read the description on the Which? web site
http://www.which.co.uk/consumer-rights/regulation/consumer-rights-act
And I strongly suggest you take the time to view their description and explanation.
I note there are special cases for motor vehicles especially related the amount of refund, but as this refers to 'motor' vehicles should not then apply to caravans which are not motor vehicles, however motorhomes would come under the special provisions.
As ever with an act of parliament, its provisions are not proven until tested in court, but it does seem a much more sensible piece of legislation than the slightly disjointed previous approach. And as previously the consumers route to a remedy lies with the seller and not directly to the manufacturer.
As Which? have not highlighted any change, I think it still encompasses both new and second hand retail purchases.