RV Mogul Don Wallace is building a 40,000 square foot mansion off of Fort King Highway on the shores of Lake Thonotosassa in Florida. Don and his family started Lazy Days in 1976 with $500, a mobile home and two travel trailers. It grew to a company with annual sales of $800 million, and its 126-acre complex in Seffner became the largest single-site RV center in the country. Once completed, it will be the 3rd largest home in Hillsborough County. With 27,008 heated square feet of living space, the mansion will boast two swimming pools, a billiards room, bowling alley,  home gym, massage room, game room, men’s lounge, his-and-hers offices, a parlor, a master suite with his-and-hers bathrooms, a croquet lawn, a baseball diamond, a massive garage, and much more. Don and his wife already own this 15,000 square foot mansion which is on the market for $10,495,000. It is the 3rd most expensive home on the market in the Tampa area.