I think fire pit also can be used as BBQ only if it is fitted with a BBQ grill, it is okay if your astove fire pit is also fitted with a BBQ grill. Btw, how many people will attend your camping BBQ? If more than 5 people will attend it, I don't think your fire pit can get every people eat at the same time. If you just want to have a family BBQ trip, it is okay and neen't get a new one. while if more than 5 people will attend your camping BBQ, maybe you should take a charcoal BBQ with bigger cooking area. just like this landmann charcoal wagon barbecue is fantastic. http://bit.ly/14rXtUb
In all, the answer to this question depends on how many people attend your camping bbq and how to get bbq site, if you take them into consideration, I think you will know if the astove fire pit suits for your camping bbq.
Good luck to you!