Buying 4WD and Campertrailer

Any dealer should be able to accomodate a full inspection by an independent workshop. If they refuse then buy elsewhere.
I have only ever bought from a dealer once. Our current 4wd. The dealer had arranged an RAC inspection, but a) it was very superficial & b) there were aspects to it that suggested to me that the inspector was not familiar with 4wd's so that is when I asked a local (10 minutes drive from the dealers premises) 4wd transmission specialist to do a full inspection for me. This cost me $200 (about 10 years ago) & the dealer took the car to the specialist after I arranged it. The specialist not only reassured me that the driveline noise that the RAC inspector had thought may be terminal, was in fact perfectly normal for the TD42 Patrol, & nothing to be concerned about (as I had suspected), but also found a number of other issues which were rectified by the dealer (eg a leaking fuel sub tank which they replaced & a few other minor things) & also provided me with leverage to reduce the price by $2000.

Car dealers, my favourite people, not.

However, I have had dealings with John Hughes in Victoria park on a number of occasions with the purchase of vehicles for kids and relatives.

Always found them helpful, easy to deal with and they have a large range of good used vehicles. They had no objection to RAC checks.

Be aware they will try and sign you up for extras eg window tint, seat fabric conditioning, extended warranty etc. You can always say no to these extras if not required.

Noting that you intend to buy an off-road trailer, it would be a good idea to research off-road trailers to decide on the type and style that suits you. Once you know the gross weight and towball weight of your preferred trailers, then you'll know what type of vehicle to buy that can legally tow it. As a rule of thumb, the towball weight is approximately 10% of the gross trailer mass
As an example, my NS Pajero has a maximum tow capacity of 2500kg. It has a maximum towball weight of 250kg. BUT (and it's a big BUT), the towball weight is reduced to 200kg if the towed trailer exceeds 2000kg.
Good luck with your purchases.