My LO hates sitting on strollers/tricycle

I really feel you on this, carrying a 13kg baby for long stretches is genuinely exhausting and it makes every outing so stressful. My girl went through a similar phase around that age where she just wanted to be held and would cry the moment we put her in the stroller. What helped us was letting her sit in the stroller at home first with no pressure, just playing around it and making it feel familiar and safe before we actually went out. You could also try starting with very short rides, even just down the corridor, so she slowly builds up comfort with it rather than associating it with long outings she cannot control.