Amazon Tyre Pressure?

[Dickster]

Hi,

I have a 2000 model Amazon VX 4.2TD, originally fitted with 16" rims with michelin LTX 275x70x16 114H tyres.

I bought a set of 18" rims off eBay (newer models standard issue).

I then looked for tyres and struggled to find the standard size of 275x60x18 for any less than @ £150 each.

I have since bought and fitted successfully a set of Kumho STX KL16 (285x60x18 116V) - 10mm wider but with a higher load and speed rating,

(They don't rub anywhere with the extra width)

My question is - what tyre pressures do i run these tyres at normally? or what are the pressures for the standard 275x60x18 tyres and do i need to increase the pressure when i'm carrying/towing a load. (26ft caravan, topbox, 4 kids, 2 dogs, bikes and the kitchen sink etc)

Any help much appreciated

Richard

PS does anyone have the 18" wheel centre caps for sale before i silicone my old ones to the new wheels (£38 each from toyota !!!)