chains are good if you make sure they are not rusting and have cracks and junk like that...
chains are not safe if you will be jerking...
straps work well too (I mostly use straps)
I get super high strength tractor straps (usually from tractor supply co.)
of course I have a taco and a runner, so my rigs are a lot lighter than your h2's...
so you may need something bigger?
(I usually get the 20,000lb straps)
inspect the straps before you go wheeling...
if there is fraying or any kind of wear... burn it now so you don't use it later!
also, keep them out of the sun...
the sun will rot the straps!
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