For now it is going to be very basic and we will be going through southern EU in summer, so hot weather. Yes right now we are making sure that the car is reliable for long trips, but I just wanted to know whether there are some modifications I can make to make the trip more comfortable /safe
If the vehicle is in top mechanical order then in terms of upgrades I would start with security. Make sure you have a good steering lock, and good pedal/clutch lock. You can fit window grills but I didn't bother as unless you fit them to all windows they will just break a different window, but I did fit a van lock with a padlock on the rear door for an extra layer, and made sure that all of the door locks were in good condition, as they wear overtime you can open them with anything!
The other upgrade I would consider if you are doing long motorway miles down to southern Europe would be a high capacity sump for the transfer box (LINK - available form other places as well). It adds oil capacity and aids with cooling, both of which are a good thing for the transfer box.
Sound proofing and a good dog crate/guard would be next on my list. in terms of order to work on things I would go for:
1 - mechanical condition
2 - under body protection if offroad (steering guard, diff guard, fuel tank guard)
3 - security
4 - long distance comfort for passengers and dog
5 - camping arrangements (sleeping and cooking only at this point)
6 - packing plan (you will need tools, fluids, vehicle spares, ontop of your camping supplies and all need to be accessible and labelled so you can find them)
7 - specific vehicle modifications (offroad ability, camping, etc)
You can get a very long way in a very standard vehicle, I would consider 1, and 2 if going offroad, on my list above the only essentials, throw a box of tools, box of spares, a tent and some sleeping bags in the back and you can go anywhere in the world. Everything else is just to increase your comfort while doing it.
