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IG Tank Accessories sprue (can be found on the page romeo linked to, above), if you want to keep to GW.
If you're more flexible, tons of historical military modeling companies put out sets of tow lines, Jerry cans, and generic vehicle stowage in multiple varieties and scales. Check out the Dakka Articles/posts on scale compatibility to find what range you should be looking for, then just browse to find the look you want.
edit: Almost forgot - lots of this stuff is dead easy to make, too. Fine (size, not quality - buy cheap!) jewelry chain, thin gauge wire, and some plasticard scraps are enough to deck out a tank in style, without even having to resort to more advanced GS sculpting or casting. Plenty of crate-making tutorials around if you can't figure it out, yourself, and the twisted wire/chain is pretty self-explanatory.
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