[TWinOKC]

What capacity straps are needed?  Some I have looked at have a strap/break strength of 1200 lbs, working load up to 400 lbs?  Is that adequate?  Are ratchets on the straps needed or is this something not really necessary?

The straps I have are old and not in the best shape, thinking of replacing them before something bad happens.  Prices are all over the place.   

[Ragmas]

that is more that adequate. imho

[barenekd]

The stuff they sell at motorcycle shops will be adequate. Wally World stuff is a bit more questionable, although should be OK. You don't really need a ratchet.
Put a tiedown on one side with the bike leaning into it, than attach the other side so as you straighten the bike up, keep pulling the tiedown on that side tighter. If you had the first side tight enough you should have it pulled all the way down when the bike is vertical. If not tight, enough just work from side to side pulling it down tighter.
Bare