After moving back to NV, I have been steadily paying off the cards (as well as making the maybe not-so-good decision to consolidate some of them). 

But if they are all that attractive you might find that doing a consolidation 1031 exchange and selling three to buy one larger asset might be easier than you think.  

I decided to pay everything down to 0% line of credit and then apply for a new loan to consolidate the rest of my debt that I have which is like 15k.

And consolidate those 1031s into the one purchase. 

My two cents is that we'll continue to see opportunities as mom and pop landlords continue to sell, consolidating more of the rental market in larger corporations.

Tax filing wouldn't be a nightmare if your accounting is clean and well-maintained, but that is something to consult with a CPA.Some of my clients have 1 parent LLC and owning 10+ LLCs and it will just go through the Parents as consolidated financial statements to present to the auditors/CPAs when doing the tax returns.But discuss with an attorney and CPA on structuring the LLC.

Just know that Fannie Mae looks at "number of financed properties"... so even if you consolidate multiple properties into a commercial loan, say you refi 3 properties on one commercial loan... that is still 3 of your 10 IF you are personally responsible for the note.  

I have been all over the map in the last ten years, from MF to lease options to new construction and I have consolidated on what has always been the core of my business, which is B+ class single family rentals. 

I do think the buisness of construction and holding property is different enough to validate another company, as I did.Might speak to an accountant to as to consolidating your earnings and having the construction comapny perform work, you may have issues if either are not making money, but it can be an advantage with multiple entities

Are there advantages for doing this or would it make more sense, over time, to have one consolidated bank account for all rent houses?