If I sold a travel trailer for more than I paid. Is that capital gains? And if so, where do I report it?

That is a capital gain and you'd report it using the "Stocks, Mutual Funds, Bonds, Other" interview.  Tell TurboTax that you didn't receive a 1099-B and you'll be dropped into an interview that's different then the interview for a sale reported on a 1099-B.  TurboTax will ask you what you sold and you can simply click "everything else", then fill in the appropriate information.