Thanks willb.
I bought a few spares when I got mine, but that was before HPI went bust. I haven't had to replace anything. The Venture does seem to be a pretty tough truck and it's very capable once set up.
I haven't tried to get any parts recently. checking online it seems some stuff is available, but needs to be ordered and then wait. At least HPI are still going as that was my main concern. If the Venture is as reliable as my 2 Vaterra Ascenders, then it won't be much hassle.