Edit, sign, and share mobile home purchase agreement online. No need to install software, just go to DocHub, and sign up instantly and for free.This is an electronic version of Form 500TX in a fill-able pdf format. The program application does all of the calculations for you. 500TX Texas Manufactured Housing Purchase Agreement. Be prepared to provide the complete serial number and HUD label or Texas Seal number for the manufactured home. Create a mobile (manufactured) home bill of sale from our template so you can document your transaction details and minimize legal mishaps.