Problems pumping up tyres!

Rider weight? Luggage weight? Tyre width? Type of roads/riding? Need to know.

But generally yes, rear tyre would be pumped up ~5% more than the front (due to rider weight distribution), so extra luggage might make that differential ~10%.

8 and a half stones. Luggage weight? Not a clue, but heavy. London roads. Hybrid powered by a shrimp of a woman.