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Professional Durability
4 Piece welded construction, gas strut sleeves and powder coat protection ensure professional durability
Heavy Duty Security
Tamper resistant push button locks, reinforced front panel and a C-channel reinforced lid provide serious security for valuables

Weather Resistant
4-sided weather resistant D-shaped ribbed weather strip and foam keeps everything dry

Integrated Features
Included plastic storage tray and no-drill mounting kit make the Defender Series truck boxes great addition to any vehicle


The new WEATHER GUARD® DEFENDER SERIES™ provides Professional Protection. These new affordable truck boxes include tamper-resistant locks, steel reinforced, looped strikers, D-shaped ribbed weather stripping, and heavy-duty welded aluminum box construction. They also come with a seven year warranty.

Need help choosing a DEFENDER Series box for your truck >

Series Model Matrix

Model No.StyleApprox. Product HeightApprox. Product LengthApprox. Product WidthApprox. Shipping Weight lb (kg)Approx. Cu. Ft. Per UnitBuy Online
300104-53-01Saddle Box18-3/16 in61-7/8 in19-5/8 in52 (23.6)9.5
300104-9-01Saddle Box18-3/16 in61-7/8 in19-5/8 in50 (22.7)9.5
300105-53-01Saddle Box17-11/16 in71-3/8 in19-5/8 in58 (26.3)10.7
300105-9-01Saddle Box17-11/16 in71-3/8 in19-5/8 in56 (25.4)10.7
300106-53-01Saddle Box16-3/16 in71-3/8 in19-5/8 in58 (26.3)9.5
300106-9-01Saddle Box16-3/16 in71-3/8 in19-5/8 in56 (25.4)9.5
300207-53-01Cross Box17-3/4 in71-1/2 in19-5/8 in56 (25.4)10.7
300207-9-01Cross Box17-3/4 in71-1/2 in19-5/8 in54 (24.5)10.7
300300-53-01Lo-Side Box12-7/8 in60-1/8 in16-5/8 in47 (21.3)4.4
300300-9-01Lo-Side Box12-7/8 in60-1/8 in16-5/8 in45 (20.4)4.4
300301-53-01Lo-Side Box12-7/8 in72-1/8 in16-5/8 in54 (24.5)5.3
300301-9-01Lo-Side Box12-7/8 in72-1/8 in16-5/8 in54 (24.5)5.3
300302-53-01Hi-Side Box16-1/16 in60-1/8 in13-1/3 in45 (20.4)6.7
300302-9-01Hi-Side Box16-1/16 in60-1/8 in13-1/3 in43 (19.5)6.7
300303-53-01Hi-Side Box16-1/16 in90-1/8 in13-1/3 in59 (26.8)10
300303-9-01Hi-Side Box16-1/16 in90-1/8 in13-1/3 in57 (25.8)10
300304-53-01Lo-Side Box12-7/8 in46-5/8 in16-5/8 in41 (18.6)3.3
300304-9-01Lo-Side Box12-7/8 in46-5/8 in16-5/8 in39 (17.7)3.3
300401-53-01All Purpose Chest19-1/4 in50-1/4 in19-5/8 in46 (20.9)9.3
300401-9-01All Purpose Chest19-1/3 in50-1/4 in19-5/8 in44 (19.9)9.3
300500-53-01Underbed Box19 in36 in19 in57 (25.9)7.1
300500-9-01Underbed Box19 in36 in19 in57 (25.9)7.1
300501-53-01Underbed Box19 in48 in19 in73 (33.1)9.5
300501-9-01Underbed Box19 in48 in19 in73 (33.1)9.5
302105-53-01Saddle Box17-11/16 in71-3/8 in19-5/8 in58 (26.3)10.7
302105-9-01Saddle Box17-11/16 in71-3/8 in19-5/8 in58 (26.3)10.7