County of Harris. §. Learn how to sell a travel trailer in Texas with our comprehensive RV Bill of Sale guide.Get step-by-step instructions, key documents, and FAQs. The form consists of the significant vehicle, buyer, seller, and sale data, along with affirming signatures from both parties. A completed Application for Texas Title and or Registration (Form 130-U); Applicable fees. A Recreational Vehicle (RV) Bill of Sale is required anytime an RV is sold or transferred between a seller and a buyer. Bill of Sale to a Motor Vehicle. MV-028. Pdf, Map for TxDMV and Harris County Tax Office Main Location. MV-050.