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Improving Canadian 5-6 axle trailers

Up here we often run 5-6 axle trailers to haul aggregates and garbage. The one that I'm thinking of is similar to this:

http://wasteequipmentexchange.com/enuuk/...

Here's a 4 axle version that might also be a possibility:

http://wasteequipmentexchange.com/enuuk/...

So how could I improve overall mpg pulling something like this? Obviously getting rid of the platform and tightening the tractor/trailer gap is one option.

1. Would short skirts help? I assume that there isn't enough room for an undertray system.

2. What kind of tires would you recommend on a spread axle that gets a lot of scrub wear? Super singles are an option.

3. I assume that a nice tight (mechanical) tarp would improve aerodynamics. When the trailer is empty, what's better - the tarp or the empty box with an open/flow-through back gate?

P.S. I don't actually own a trailer yet - I'm just thinking out loud.

Thanks!

Answer this question I have this problem too

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I meant skirts between the axles, not hiding the tires. But it is an interesting idea. I don't think it would fly in winter though.

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Wide single all the way around would help. you make have to experiment with which model tires to use. XOne XTA's might work well on the tri-axle and XOne XTE's on the forward lift axles. Of coarse lifting all but one or two axle while empty should help.

Skirt's may work if you get wide singles with 0" offset and have the tires inside the skirt's but you may have problem's with the DOT.

Airtabs if you can.

Microblue bearings But*** I have been told that if the bearing are adjusted the MDAlign way you get Zero Improvement.

Update

Jerzy, Chad Hohn in kansas city. The problem is Microblue and MD Align have different setting for wheel baring ajustment. MD Align solution you will not have tire wear issues from loose wheel bearings, Microblue solution you will wear out the inside edge of the tires.

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Jason, who have you heard that from? I've been thinking about the micro blue bearings but have had my regular ones adjusted as per md and would like to know if the micro is going to be a waste of money.

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Ok, i had in my mind that it would be an issue on the tractor instead of trailer. Thanks Jason.

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All the things that work on a two axle trailer would work on a 5-6 axle trailer.

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No - I'm concerned about the airflow underneath the trailer. There are too many axles to make an undertray system effective. So what else can I do?

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The under tray won't do you any good being so far forward under the trailer and without the diffuser on the rear they are pretty worthless anyways. Whether it's a 4 or 6 axle set it up to have as many liftable ones as possible to reduce resistance when empty- kinda like the michigan set ups.

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you can't put wide singles on.not recognised after 80,000 lbs.hauling this configuration,and fuel mileage don't go together.get a better rate your gvw is probably 140,000lbs.more weight more fuel.big engine with pittsburgh computer programming will help with efficiency.when i haul a tri-axle 100,000 lbs fuel mileage is frustrating extra axle drag more weight.find a different config. 5 axles total 80,000lbs max.then worry about fuel mileage.looking at both configurations,i don't think fuel mileage is going to be possible.get a great rate.you're going to need it to pay for fuel

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Of course a better rate always helps - but so does cutting costs.

As for super singles, yeah they are not allowed in the U.S. above 80k - but they are allowed in Ontario/Quebec (not sure about other provinces).

Here's Verspeeten's new trailers:

http://www.trucknews.com/daily_images/10...

http://www.trucknews.com/daily_images/10...

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Yeah, I'm pretty sure that the wide singles are ok in the states over 80000lbs because i ran 84000lbs with permits for overweight with my truck and used to work for a company running 90000lbs gross on singles. Orourkesean15 is talking about the canadians and super singles.

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