A recreational vehicle may include a chassis, an axle assembly, a floor, and a vehicle body enclosing living quarters. A fluid storage vessel may be supported in the chassis. The chassis may include a first and a second longitudinal chassis member each having an upper and lower edge, and an inner and outer face. Cross members have a first and second ends connected to the first and second chassis member, respectively. The cross members have an upper and lower edges extending between the ends. The cross members have an end height at the ends and a midsection height that is greater than the end height. A transport area extends longitudinally between two cross members, transversely between inner faces of the longitudinal chassis members, and vertically between upper and lower edges of the cross members. The fluid storage vessel is disposed in at least a portion of the transport area.

A recreational vehicle may include a chassis, an axle assembly, a floor, and a vehicle body enclosing living quarters. A fluid storage vessel may be supported in the chassis. The chassis may include a first and a second longitudinal chassis member each having an upper and lower edge, and an inner and outer face. Cross members have a first and second ends connected to the first and second chassis member, respectively. The cross members have an upper and lower edges extending between the ends. The cross members have an end height at the ends and a midsection height that is greater than the end height. A transport area extends longitudinally between two cross members, transversely between inner faces of the longitudinal chassis members, and vertically between upper and lower edges of the cross members. The fluid storage vessel is disposed in at least a portion of the transport area.

A vehicle-body structure includes a floor panel constituting a floor of an occupant space, a center frame disposed to be higher than and away from the floor panel at a vehicle-width-direction central portion of the occupant space and extending in a front-rear direction, and connecting members each extending upward from the floor panel, having an upper portion fixed to the center frame, and connecting the center frame to the floor panel.

An electric-vehicle-body structure includes a floor panel constituting a floor of an occupant space, and a center frame disposed to be higher than and away from the floor panel at a vehicle-width-direction central portion of the occupant space and extending in a front-rear direction. A battery unit includes battery frames disposed at a lower position than the floor panel and extending in the front-rear direction. Such a positional relation is achieved in which the battery frames and the center frame overlap each other in a plan view.

A vehicle-body structure includes a first floor panel constituting a floor of an occupant space, a dash panel, a second floor panel provided on a vehicle rear side of the occupant space, a connection panel connecting a rear portion of the first floor panel and a front portion of the second floor panel, and a center frame disposed to be higher than and away from the first floor panel at a vehicle-width-direction central portion of the occupant space and extending in a front-rear direction. A front portion of the center frame is connected to the dash panel. A rear portion of the center frame is connected to the connection panel.

A vehicle-body structure may include a floor panel constituting a floor of an occupant space, a center frame disposed to be higher than and away from the floor panel at a vehicle-width-direction central portion of the occupant space and extending in a vehicle front-rear direction, and a control device configured to control a control target unit mounted on an automobile. The control device may be arranged at a lower position than a vehicle front portion of the center frame.

A vehicle-body structure may include a floor panel, a dash panel extending upward from a vehicle front portion of the floor panel and partitioning a vehicle front portion of an occupant space, a cooler disposed on a vehicle front side of the dash panel, a control device disposed in the occupant space, and a supply pipe through which a heat exchange medium subjected to heat exchange at a heat exchanger is supplied to the control device. The heat exchanger may be closer to the control device than a powertrain PT mounted on an automobile.

An electric-vehicle vehicle-body structure may include: a floor panel constituting a floor of an occupant space; a center frame having a hollow shape, disposed to be higher than and away from the floor panel at a vehicle-width-direction central portion of the occupant space, and extending in a vehicle front-rear direction; and an air introducing duct that provides communication between an air-conditioning device and inside of the center frame and through which air-conditioned air is introduced into the center frame.

To decrease the retraction amount of a traveling motor at front collision. A vehicle-body structure includes a floor panel constituting a floor of an occupant space including a seat on which a passenger sits, a center frame disposed to be higher than and away from the floor panel at a vehicle-width-direction central portion of the occupant space and extending in a vehicle front-rear direction, and a connecting member extending upward from the floor panel, having an upper portion fixed to the center frame, and connecting the center frame to the floor panel. A traveling motor is arranged on a vehicle front side of the connecting member.

To suppress vibration and noise due to load input from a rear suspension device, a left-side load input portion that is fixed to a left-side rear-side frame and to which a load from a rear suspension device is input, and a right-side load input portion that is fixed to a right-side rear-side frame and to which a load from a rear suspension device is input are provided. A cross member is provided at a position lower than the left-side load input portion and the right-side load input portion to which loads from the rear suspension devices are input. The cross member and the left-side load input portion are connected through a left-side rear connection frame. The cross member and the right-side load input portion are connected through a right-side rear connection frame.