In reply to Nbrain:
Our pointer wears a Ruffwear webmaster and it seems to work pretty well - we only ever use the handle on it to get her over stiles and she's usually helping (or not!) We like it because it keeps her chest up - her back end is less of an issue as the chest end is the business end. I'd be thinking about a sling arrangement in conjunction with the Webmaster if we wanted to haul her any distance. She'd have her own opinions about that...
Where are you based? If you find yourself in Keswick, go into Podgy Paws (next to Booths supermarket) - they have loads of harnesses and are really helpful about trying different ones on your dog. We have a Finnish brand of very lightweight harness (Hurtta) as her running harness, and some Ezydog gear too (I think their range is pretty good).