You should always be using hrTSS for any aerobic/anaerobic activity! So if you did a hike with 3,000ft and 10% body weight you should add an additional 40TSS on top of your hrTSS. As long as you are consistent with the way you add TSS onto weighted uphill hikes your data will work great! This is how I calculate it additional TSS for my athletes.
This article explains it in another way, slightly different than Carolyn and I calculate but the same exact idea with other examples: https://uphillathlete.com/aerobic-training/trainingpeaks-metrics-ctl-tss/
I hope that helps!