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Swift have recently and sensibly been fitting tyres that 'comfortably' carry the original weight of the van, they've alway offered, (in some cases), an 'upgrade' on the MTPLM should you require it, this in the past would automatically also have required a change to stronger tyres

Changing now only involves supplying a new weight plate where the declared MTPLM is increased, in your case to 1500kg, to my mind they have simply, (perhaps over simply), covered both options in the manual.

My pressure book shows 55psi to be bang on for 1336kg and 65psi for 1550kg

In truth then and nothing to do with you, an increase in MTPLM to 1500kg would still require 185R14 tyres with a 102 load index to maintain the original safety margin!!