AxeAngel, it depends on the trails. All of my pics of trails were run in my '98
D1 with no lockers and no TC(not that any D1 has TC). The only place I struggled a bit was on that climb on Fins N Things and that was mainly due to poor spotting. Once I slid over to a better line I climbed right up. I ran Top of the World, Poison Spider, Fins, and Hell's Revenge. The only obstacles I didn't due were on Hell's, those being the Escalator and Micky's Hottub. Mainly because I didn't want body damage, and the buggy we were with didn't make the escalator so I figured I'd pass.
Other trails lockers are really helpful but can be passable if you're with someone willing to winch/tow you in a couple spots.