While driving home with a loaded trailer behind the P38, the rear left airbag blew. All airbags were replaced 2 years ago. Are there heavy duty airbags to be had?

Drove to Ross on Wye and home again, some 220 miles. Nearly didn't begin the journey because the air suspension wouldn't lift the RR. Was about to go in the old Defender when the RR lurched and rocked and achieved driveable height! My passenger didn't enjoy the journey because the heater only...