Joe4d not necessarily... my gelding has travelling issues, much much better in a super-wide bay or with the divider tied across.
What my boy does, from watching him from behind, is he leans into the corner too much [anticipating a really tight turn I think], overbalances, and then has to scramble to keep his feet. He's getting better [haven't had a big scramble in over a year just little ones] but I prefer to travel him so that he's solid. Last time he scrambled [minor scramble!] he nicked his fetlock [on the way to a show!!]... rather not have that happen again. And if all of a sudden he starts scrambling badly again, he could do a lot more damage to himself than he did with a minor scramble in quite a safe trailer!
I haven't travelled my gelding on a slant load, and I actually think in his case it might make him worse. In a straight load trailer he chooses to stand straight even with the divider tied across so he can choose to stand on an angle if he likes. I think it would stress him out to put him in a slant load, and when he's stressed his scrambling is worse.