Still dips at the back

When I bought Stan the van it dipped at the back nearside. Sent the rear leaf springs to have them re-tempered, as they didn’t have the correct curve. As the rear axle had to come off to get at the springs, I thought I’d send it off for re-furb and made the mistake of telling them I wasn’t in a hurry. The springs came back all nice and correct, so fitted them. After just over 12 months finally got the rear axle back with all new bearings. Just finished putting the axle and wheels back on. Stood at the end of the drive…and low and behold Stan dips at the back near side. I guess I need to find somewhere that can straighten a chassis