The advantage of canvas truck is that the height of the cargo can be adjusted flexibly. You can easily ask the transporter to raise another foot up. Let me show you a simple calculation:
Normally lorry, truck or trailer comes with 20ft, 30ft and 40ft with the width of 7.8ft. Say, simply ask the transporter to stack another foot high, you can earn an extra 156 c.f., 234c.f., and 312c.f., respectively, without extra charge. That is also equivalent to roughly RM90, RM140 and RM180 worth of space, respectively.