Replacement tyres

Caravan tyres are usually commercial vehicle types and not specifically for caravans. You need the full rating from the side and most firms will then be able to quote you but it is often better to speak to them rather than use the internet. We found e tyres very helpful and as they come to you there is no problem getting in and out of tight tyre depots.

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fit shocks if not already fitted.

I got both of our caravan tyres changed last year.  I just went into the local Watling Tyres with the spec from the sides of the old ones, and they ordered the correct replacements (commercial) and fitted them at our storage site.  The only issue was that the previous owner had Tyron Bands fitted, so they had to take the wheels off the caravan and back to their workshop to fit the tyres.  I had mentioned this when I booked.  It was all done in a couple of hours.  

Your caravan manual specification will tell you what tires are needed... Mine is  185/75 R14  96T, In english it means this:

185 = Tyre width in mm across the tread.

75 = aspect ratio (height from tyre inner rim wall to the top of the tread.
R = Radial Tyre  14 = Wheel rim diameter in inches

96T (This is the important bit for caravans) 96 = the weight in KG each tyre can bear plus its speed rating in this case T = up to 118mph.
as caravans can only legally be towed in the UK @ 60mph S&T ratings are more than adequate. 
To find the weight rating of the tyres you need without the handbook...
Look at the weight plate.. note the MTPL figure & divide it by the number of tyres that your caravan has in contact with the road.. then refer to a chart to calculate the correct weight. 
usefull links: 

https://www.caravanclub.co.uk/advice-and-training/taking-care-of-your-outfit/caravan-tyres-and-wheels/sizes-and-specifications/

https://www.tyresizecalculator.com/plus-sizing/tyre-size-designation