We are looking for a 3 wheeler pushchair for DS 9 months. We had a great one for DD (now 5) but unfortunately the wheels got turned to concrete after a particularly muddy Land Rover show (lots of rain and mud, show organisers decided to put down straw to make walking easier - result a bit like wattle and daub walls on an old house!)
DH is SAHD and will be the main user, for the schol run (flat street walking), out and about generally but also when camping, walking, going to Land Rover shows etc. Needs to be fairly robust for these events whih can be quite muddy.
DS is only 9 months but big (98th percentile height and weight) and likes to be able to lie down to sleep in pushchair but also when sat up likes to be very upright. We have a separate car seat so only need pushchair.
When collapsed it will need to go in the back of Land Rover but be compact enough it can be strapped to side in boot so dog can get in as well.
I use public transport fairly regularly as I can't drive (helath reasons) so easy to get on buses and into taxis if required. This is minor as it is mainly DH that will be using it.
We have looked at a couple but can't seem to make a decision so need some advice!
We don't have a huge budget and will probably need to buy second hand from Ebay.
We have seen the Mamakiddies 3 wheeler on there new at £109.99 which looks ok but can't test it out. We tried a Quinny Speedi (older model but new) which we could get for £160 from a small independent retailer and we also have access to a local baby shop which can get discontinued models or good secondhand for us if we ask. We have seen a Jane slalom pro on ebay but DH didn't like the clear plastic section on hood 
So ..... what is the best 3 wheeler on the market that we can get to meet our needs? What should we be looking for on Ebay? Any top tips on what to avoid?