You could cut it in half or thirds, and experiment with different techniques, rubs, injections etc. The smaller pieces will be easier to manage on the UDS.
Number one rule when cooking pork loin... Do not overcook it! Keep an eagle eye on that thermometer, and don't let it go past 140 on the cooker. Tent/rest for 30 minutes and enjoy. FYI, loins cook up fast, so the cook time should be less than 2 hours, and may be closer to 1 hour, so pay attention.
Was recently reading a post where some dude smoked a loin for 5.5 hours...... W... T.... F!
Seen far too many ruined loins that are cooked to 155 and above. It breaks my heart! :icon_shy
Since we're talking about smoking, I'd also recommend keeping it as cold as possible before tossing in the cooker. Better chance for bark and ring before reaching 140 or lower like Ron said.