Thanks all. To confirm, It sounds like cannibalization is not occurring. So, the three-size category landing pages receive link juice from their 7-12 respective product pages and combine (on that site) to one main navigation landing page. The structure is appropriate for that site. The home page then combines all link juice.

Another site has separate main navigation tabs for each of the 3 sizes, but they probably just support the home page ranking because there are only 6-8 products each (all products have h1, meta title, and description, a small amount of word content, but lots of pictures and diagrams).

Currently, I don't have word content on that master page because its purpose is to guide visitors to the size they want but sounds like I should... and beef up word content on the category landing pages. It's not easy when all that distinguishes them from one another is size, but I can do a little.

I rent trade show displays, and clients pretty much search for variations of those words only, and Google recognizes them as the same.

Probably, the most important thing is to have the word "rent" in an h1 and meta title on the category landing pages (and size as appropriate).

Questions: 1. Only a few Keyword searches are used for a huge variety of products in my industry. Google recognizes that and auto-returns appropriate search results. For example, “Two story” brings “double deck” results interchangeably. If two or more pages use one of those words each, will they cannibalize each other?

2. Size-specific product results do come up in searches, even if their keywords are the same as those on other pages. What is the degree of cannibalization if pages have the same keywords but are distinguished by size?

3. If 70 products have meta titles and descriptions, each on a separate page, will those products result in cannibalization?

I'd appreciate meeting a true professional, not just an amateur pressing a button or using an automated report to sell themselves.

Help would be much appreciated! My 4 sites are 150% legit, with more individual product content than anyone in my industry.