Three Link Trailing Arm Size?

[v-twindad]

Hello all, I have a B-mod thats a 4-link now but Im changing to a 3-link due to new rules. I was wondering if 5/8 steel swedged tubes will be sufficiant for the two lower links, right now it has 5/8 for the uppers and lowers and I was just going to remove the two uppers and just continue to use the same lowers, will they be strong enough?

Thanks
Chuck