Tramadol is absolutely not "a weaker opioid than kratom".
Tramadol has a full agonist metabolite that's roughly as potent as morphine.
Kratom is barely a partial agonist, not to mention kratom powder is full of antagonists & dopamine blockers. It's related to the coffee family after all & coffee is loaded with opioid antagonists. It's incredibly weaker than tramadol & even codeine.
This is why you keep needing to take trams ontop of kratom, because tramadol is literally a full agonist (or it's active metabolite is anyway), with a longer duration than kratom. Tramadol is also a TAAR1 agonist and causes a weak serotonin release similar to some stimulants. Tramadol is 100x better of a drug than kratom IMO. I have never felt anything remotely close to an opioid effect from kratom. I have bags of kratom sitting around & if they had any worthwhile effects, I wouldn't still have them. Kratom isn't going to cover all the withdrawal from tramadol either. In fact, I'd say it could make it worse.
Tramadol use to be my drug of choice when my opioid dependence started (well over 15 years ago now).
400mg of tramadol had me nodding very similarly to heroin or any other opioid (when my tolerance was low enough).
Kratom however, has never given me any euphoria, let alone made me nod.