Whoa!
I can't speak to the OP's question about Tucker bogies (actually called "idler wheels"), but as far as track belting I didn't think they were competitive at all, price-wise.
I'm a BIG fan of Tucker, and have purchased more than a few parts from them, but I was quoted $220.00 per belt for a single 1600 series track belt (which is pre-punched and has the end lacing installed).
The Tucker belts are 220 PIW (pounds per inch width) and I found belting at roughly $50.00 per belt which was 330 PIW and was unpunched and needed end lacing.
Considering that a Tucker has 16 track belts, and based upon several comments from forum members, I'm going that route.
My experience is: On many, many parts Tucker is very cost competitive and on some others, they are very spendy. I will always call them to get their pricing, but I'll also call other suppliers.
I will say that Tucker's customer service is exceptional. Their parts and service manager is an exceptionally "good guy" and they don't treat their shipping as a "profit center" (a concept which I find very offensive), they also ship parts right away.