Thinking about ordering a couple of pre-mounted galvanized trailer wheels. 225/75R15 with a 6 lug 5.5 inch pattern. I would think premounted would be cheapest, but maybe not? Any links where to get a good deal? Thanks.

Here is where I purchased mine. They supply a lot of the major trailer manufactures.

http://www.tredittire.com/

If you are looking for cheap and dirty, they usually sell basic stuff at Northern Tool.

But I wouldn't go with the cheapest. Trailer tires are definitely where I do NOT skimp on my setups.

I got one off ebay 130 shipped to the door.

redneck trailer supply

Where do you recommend to purchase wheel/tire combo. Also what brands do you suggest?

Maxxis trailer tires are the best ST tires out there.
IF you have to stay with 15" wheels/tires; I'd go with the Maxxis. They make an E load range 15" trailer tire; of which I just bought 2 of them a few months ago on eBay.
http://www.maxxis.com/catalog/tire-1...al-m8008#sizes

I bought 15" trailer wheels from www.tredit.com .

BUT, if you can upgrade to 16" wheels, the general consensus is to run LT truck tires on tandem and triple axle trailers. There are quite a few threads on this topic.
My personal big boat trailer has 16" Goodyear Wrangler HT Light Truck tires on it, same as Myco put on it when it was new. My last big boat trailer had Firestone TransForce LT tires on it.

Thanks for the info. As of right now I have 14" aluminum wheels which I want to ditch and go 15s and get a decent rubber. I will look into the sites you supplied and keep on with my research. Trust me I have read endless amount of threads of people's back and forth opinions lol

Thanks for the leads guys I will check into them.