Every once in awhile I run across an ad where the rig, instead of duallies (with the requisite 6 lug axle) appears to have two axles.  See attached.

In other words, one wheel is to the rear, not the side, of the other, so it looks like both rear tires are easily accessible to air up and/or replace?  To me this seems like a big benefit, but maybe it's offset by maintaining two axles?  Not being up under one or truck expert I assume it's two axles...

Would this setup negate the need for the 6 lug axle (for those of you unfamiliar with the motorhomes most of the ones through 89 were recalled so these could be put on)?  I'm wondering, since this is a 1980 if this was an alternative option.

I've asked this question on another forum, but wanted to get opinions here as well.  If you've seen my question elsewhere, apologies!

Here's the ad (Durango, CO) in case anyone is looking and interested:

http://denver.craigslist.org/rvs/5516029652.html

Tags: axles, rear, toyota, wheels

Views: 117

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Toyota experimented with both options through out the years, The H/D Dually pick-up. a.k.a. one tons.

With the Duallys, the side to side stability was greatly increased. With the *floater tandem style,one wheel behind the other, leveled out the *tail weight of the truck. After numerous studies and input,, The Dually version worked best in over-all stability of the vehicle. In 1978, Toyota used their mini motorhome version of the Dolphin and installed a floater axle behind the dually wheel set up. The dually wheels were 15 inch rims and tires and the floater was 13 inch wheels and tires. The driver had a control lever that they would *lift the floater axle UP while making sharp turns, and then LOWER when treking along on the highway.

The Dolphin originally had the 22 R 4 cyl,(upgraded 20 R engine, from a 2.0 L. to a 2.2 L). It had the 5 speed manual, with the upgrade version to 4 speed automatic. The manual had better fuel mileage and torque over the automatic. They also put the V-6 as an option, but the first generation V-6 were prone to blowing head gaskets. It took Toyota 4 years to work the bugs out of that problem.

In my opinion, I would opt for the DUALLY rear axle, over the twin singles. Ive run both options and with the dually rear end, you have a lot less *side to side wondering and wobble, especially with a cross wind.

Thanks.  That makes sense. And lots of good additional information here, too.  I had read a little about the head gasket issue, so good to have it reiterated.  And, the comment on the difference between the manual and automatic is useful as well.  Being in the mountains, having to get out and back in again, I feel partial to the six cylinder, but people seem to love the four for reliability/fixability.  One in my neighborhood is a four and the woman said she never had any issues (as long as you don't mind putting on your flashers and letting the big rigs push you up the mountain).  She's one tough lady, though.  I don't think her rig would have dared argued with her.

Reminds me of what me and a couple of my mechanics had done to a Sun chaser mini M/H once.

(I owned a Toyota rebuild shop in Michigan for 15 yrs). We shoved a 350 chevy engine under the hood with a 2 speed power glide trans,(yes we hacked and cut and chopped to get the engine and trans in there). But garranteed it would climb a steep grade with out a lick of problems, The only draw back was when ya rapidly accelerated from a red light, everything that was stowed in the cab ended up in the far back corner of the RV. Of course with THAT MUCH OVER KILL POWER UNDER THE HOOD,, we didnt care about gas mileage.(side note,,, The original front suspension didnt fair very well with the *upgraded V-8 shoved up under the hood.)

And Yes, the 4 cyls are way under powered for the weight and the newer 6 cyls,are better made and actually get decent fuel mileage.

Glad you joined and posted!  Sounds like you are wealth of information on these.  Interesting idea to drop a different engine in but I'm pretty comfortable leaving in what fits - LOL.  

I've read you can put a different gear ratio in these to help as well...?

But if I did I'd have to find someone for that.  I'm having an rv port built and planning to do the interior, systems,some exterior and basic engine maintenance myself–but I'm going to be relying on finding and using a good local mechanic.

I've been a little discouraged researching the last year.  These little toyota homes aren't as common on the east coast near me, and most of them that come up are four cylinder. Which seems weird to me.  And when one comes up in reasonable shape, they're not cheap. I know no matter what I spend initially,  the money will just keep draining out.  So I've come to the conclusion I'd rather go cheap and put my money in rebuilding her from the ground up.  The question is going to be, how much of a disaster am I willing to take on!  Um, oops did I say that?  I meant labor of love...

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