RDS Fuel Tank Toolbox Combo - 90-Gallon Capacity, Model# 3490115 Works well with fifth wheels Smaller than most 90-gal. fuel tanks Fits some short beds; please measure before ordering Diesel install kits (Item#s 3490901, 3490902 and 43748), are also available (sold separately) It is the user&#39;s responsibility to comply with local, state and federal requirements pertaining to safe transportation, loading and discharging of tank contents