Hi, and welcome.
Originally posted by Aslyfox Tamron 70 - 300 mm macro zoom af
Vivitar Series 1 lenses: 200 mm prime af in lens body, 28 -105 mm macro zoom mf, and 70 - 210 mm macro zoom mf.
Pentax: 18 - 55 mm smc pentax dal af zoom and 50 - 200 mm smc pentax dal af zoom, 18 -55 mm smc pentax da mf zoom
I'm not completely clear. Are these the lenses you have and are trying to choose from for your trip, or are they lenses you are deciding whether to buy? Also, that last one: 18-55 DA manual focus? Shouldn't that be AF?
You want your best camera body (or bodies) on the trip; that means the K-3 when it arrives and the K-5ii as backup/second body. The 150-450 with TC, if you rent it, will work best with the K-3 as it offers the highest pixel pitch and therefore scope for cropping in post (from what I've read, it seems that for wildlife photographers, no lens that you can carry around easily will ever get you close enough on its own).
The *ist-DL is a lovely little camera and I wish I still had mine (it died about four years ago), but it's so far behind even the base model K-5 when it comes to high quality at high ISO it isn't funny. Then again, if you're one of those people who swears by (what some regard as) the special rendering qualities of the CCD sensor in these older cameras, you might consider taking it as a second body.
As for the Nikon, I replaced a stolen Nikon Coolpix 8700 with an *istDL and felt the *istDL was the superior camera (the NIkon did video which the *istDL didn't, but I am mostly a stills shooter; this may or may not apply to your style and the types of images you want to capture.)
I hope my thoughts are useful.