The Sonic 7336WS is twin tank design and is Weedseeker inetrgrated 

It is also dual rate capable with a detachable back

• 7000 ltr main tank
• 3000 ltr weedseeker tank
• 1200 ltr flush tank
• 100 ltr hand wash
• steerred  BPW tandem axle
• parabolic load sharing suspension
• 540/65 r 28 tractor tyres
• twin 9305CHM3 Hypro 2" pumps
• Sonic 2708 smart box
• large 100mm pressure gauges
• double suction filters
• wing tip break aways