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I think it is not necessary to redirect the duplicate domain, just a faster way 2 show that the content is on the original only.

Depending on the topic and competitors, changing the title can make a huge difference and that pretty quickly...

Yep that would do it, but it is a little bit tricky with the brands. You know an "adidas predator" page will never rank for "nike air max" but both ar shoes.

So you have to make clear that it is not 90% branded traffic , it should be more unbranded keywords.  In this case - before I would do anything, I would try to figure out why subfolder 2 is ranking for these terms and why subfolder 1 is not.

he said "in crawl error section" and I thought "fetch as google section" My fault

I was wondering about site/ brand-names added to the title by google to, than I realized that Google is only doing this brandname at the end (and truncated titles to display the brandname completely) for searches that are also including the site or brand name. The same search without the site/brand name shows the usual title tag.

Maybe you should check that.

Wohoo, thats looks like a broken website.  I mean, the hompage is nearby empty.  That is thin content.  
And on mobile .... White burger-menu on white background? Not a good decision.

Some Content Pages look good on mobile, so its not really empty.
Chrome Console gives me a lot error-messages.
You have comparison pages and they are nothing but duplicate content.

Thats just one visit and took me one minute. I think you have a lot of problems and I bet you know a lot (from a users perspective), you need a plan how it should be and try to make a strategy how to reach that level.

Sorry I am running out of time, but there is a lot of stuff to do.

I would simply ad noindex in taxonomy (tag) - easy done with yoast, otherwise edit header.php and ask if is tag, than noindex meta tag. I guess it is Wordpress

I bet you will find noone who tested it. I can just tell you, what I would do and why.

I would take a new domain and here is why: Using a subdomain is like using a new domain. so why take a risk when not needed? I mean, in theory, it is like a new domain. It should be possible to pick a subdomain without problems. But I wont do that because I don't know how Google is treading porn-sites really.

target for optimization may be: Make it easy for a user to login with all devices

I watched both pages now and what I can say is - I like your page more
I love that the first four results don not use that title: "tiny house trailer"

I really think you are a lot better in a lot of things - I checked a bit, I found a lot of duplicate content - Aaron Gray hint with copyscape was a good one It's also the same image, that could be a reason

http://www.copyscape.com/view.php?o=31218&u=http%3A%2F%2Fwww.tinyhomebuildingcompany.com%2Fplans---trailers.html&t=1443515521&s=http%3A%2F%2Fwww.tinyhomebuilders.com%2Ftiny-house-trailers&w=123&i=1&r=1

Matt Cutts said once  in a video that "the punishment will not be passed on to your site. However, you will lose the value of the untrusted site's link."  But if it was nofollow, it never had value.

How they figured that out? Maybe they talk to each other, or they are simply not visible in Google anymore. But they can't know that for sure . At least it wont hurt you. Google them, put them into rank trackers (semrush or whatever) and see if there is some big change in visibility. Than you can asume a penalty or update hit.  But, I bet John Muller also said, what Matt Cuts was saying, normal case - no passing of punishment.

if there is no difference, why try to do as if? 
If the products are similar and the image is the same I usually take the same image.

I don't know the shop and products, but if the products are the same, even the description, content and so on, you should think about using a canonical tag (from an SEO perspective):
https://moz.com/blog/canonical-url-tag-the-most-important-advancement-in-seo-practices-since-sitemaps

Like [Peter Nikolow](https://moz.com/users/view/397332) said, you need a special sitemap - that one for both like the code above or in his link i guess, or a special mobile sitemap. Your mobile Sitemap is not a mobile Sitemap, the mobile one should look like this:

 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:mobile="http://www.google.com/schemas/sitemap-mobile/1.0"><url><loc>http://mobile.yourdomain.com/article100.html</loc></url></urlset> 

even seomoz.org is shown when you search it with site-parameter.
No error as long as it is not shown for search queries

Its a redirect from non trailing-slash to trailing-slash version of the page, which ends up in a broken 404-Page.

Remove all internal Links to the Dealers/Downloads page. That should solve the Problems from an SEO POV. But why the 404-Page is broken? Think it is  the breadcrumb, shouldn't came up if all linked Pages exist. Funny is - I don't saw breadcrumbs anywhere.

BTW - on my Laptop it is impossible to use the menu.  The basket Icon is in the second line of your menu, makes it impossible to click on a sub-link in the menu.

Thats a really good question and I can only tell you my own point of view. Even in SEO-world in done and not done. I just think like this:

According to Google, use nofollow for

• not trustworthy pages you link to
• paid links
• crawl prioritization

So one and two  is not the case (hopefully I can trust your socials). 
To Point three, some webmasters really want to safe "PR" or "DA" with not passing it to pages using nofollow. This is not working, the PR is just send to nirvana. You can't save it, it is divided by links - no matter if the are followed or not. So the only reason in point 3 is - you don't want Search Engines to notfollow and notindex your socials (last is done if you nofollow them or not) - so my Point of View:

I just use nofollow in cases Google says I should (you can btw read it here https://support.google.com/webmasters/answer/96569?hl=en). Socials is not one of these cases, so I use Follow .

Add: Comments and User-Generated-Content is also a good Idea of using nofollow - dont know if Google mentions that on the given Page)

If all your internal links go to the final url  (https & www ) you won't have this issue. 
But if you link to http or without www internaly, then this issue comes up. So simple, don't link  to pages wich redirect, link to the final url.

What yoast told you is correct, you want wrong set backlinks redirected to your final version or sent the direct traffic to your preffered domain....

Fast answer is click on the face and scroll down. Not sure if you really have to scroll, yoast design was changing last weeks. But you will find it if you click the face.

Ok that should answer everything, because Yoast shows you what it means you are not doing or not doing good enough.  And what todo exactly! For both KW-Optimization and Readability.

Special for readability is, you can click on an eye-Icon wicht shows you the sentence where you are doing wrong in a colored mark-up.

But, to see this, you cant be in most Pagebuilders, you have to be in the WP-Editor mode, so for some Pagebuilders  eg Elementor you need to go to WP-Editor. to see what yoast is saying.

And for some other pagebuilders, yoast sometimes don't see the text and dont know if it is optimized. But in this case the face would be red I guess.

Google Analytics will track everything if it is implemented and it is working. It doesn't matter if the page is noindex or nofollow. That has nothing to do with Google Analytics. Not sure what you mean with "external site links" - but whatever you mean, guess you do it on your follow/index pages, so it will work.