Up to 20,000, IF the tires and axle are rated for it, and so long as the truck is within legal weight limits and bridge law formula.
40,680 lbs.
What's the configuration? For a single axle straight truck, the allowed interstate gross weight is 33,000 lbs. For a tandem axle straight truck, it's 54,000 lbs. For a tractor-trailer, it's 80,000 lbs.
Well, the question is really too vague to be answered. You said gross weight, implying you want a loaded weight. Volvo manufactures and sells many different models of trucks worldwide. We have no way of knowing if you're referring to a Volvo truck in the United States, South Africa, Australia, the United Kingdom, etc. The allowable gross weights will vary between jurisdictions. Also, you did not say what configuration of truck - again, for all we know, you could be referring to a single axle straight/rigid truck, a tandem axle, a tandem axle with additional lift axles, tandem axle twin steer, single axle articulated truck, tandem axle articulated truck, etc. Typically, however, a sleeper cab truck and daycab truck are allowed the same gross weights.
Soda distributors use a variety of trucks, and it would've helped if you'd been more specific. The vendor could be operating anything from a pickup truck up to a five axle tractor and semitrailer unit. Single axle straight trucks would be allowed a maximum gross vehicle weight of 33,000 lbs. under the federal regs. Single axle tractors and single axle trailers (which is possibly what you had in mind) would be allowed a maximum gross vehicle weight of 52,000 lbs. under the federal regs. Five axle tractor-trailer combinations are allowed a maximum gross vehicle weight of 80,000 lbs. under the federal regulations. Some states have higher weight allowances for vehicle restricted to travel within the state.
20,000 on the steer axle, 34,000 on the drive tandems together.
It's a dump truck with four axles--the steer axle in front and three axles in back. One of them moves up and down via a control in the cab, so the tires aren't on the road if the truck's not loaded. A tri-axle dump truck carries more weight than a one-axle or two-axle truck.
Depends on what axles came on the truck and their weight ratings. For example if the truck came with a 9000lb. capacity rated front axle and a 18,500lb. capacity rated rear axle, the gross vehicle weight of the truck would be 27,500 lbs.
In the UK, the maximum axle weight for a trailer axle on a 6 axle trailer is 8500 kg. In addition it must have road friendly suspension. With a 5 axle vehicle the maximum axle weight is 11.5 tonnes.
Gross 52,000 lbs
Vocational trucks are allowed more weight per axle than a tractor and semi trailer. The overall allowed gross weight depends on a number of factors... type of road they're on, wheelbase, etc. Typically, a gross weight of between 52,000 and 54,000 lbs. is allowed. Typically, the drive axles are allowed a combined weight of 34,000 lbs... some states have higher weight allowances grandfathered in from before the federal bridge law went into effect (e.g., you're allowed 36,000 on a set of tandems in Colorado). The steer axle can be up to 20,000 lbs, so long as the axle and tires are rated for it... you wouldn't be allowed to gross 20,000 on that axle if you're running a 14k axle and tires.
weight should be over the axle,60% fore - 40% aft
Depends on what the tare weight already on the axle is. Generally, you can take your tare weight, subtract it from what your gross weight would be allowed on the low tonnage road (21 tons or 42,000 lbs. on a tandem truck), and you generally won't be harassed as long as your gross weight doesn't exceed what it would be allowed in accordance with the restrictions of the low tonnage road. But this is in no way guaranteed, bear in mind.