to Add On Rooms Online, a division of First National Sales & Trust, Inc. We are the Midwests only provider of high quality Custom Room Additions for Mobile and Modular Homes. We serve the four state area including; Missouri, Arkansas, Kansas and Oklahoma Call the leader - First National Sales & Trust Inc, for a FREE quote at 417.475.3402 - or click here to fill out our simple online request form. All prices and specifications are subject to change without notice if a contract is not signed and dated.