Well after having a sleepless night due to Mark mentioning articulation and Chris mention having a rear lift axle I decided to do a little redesigning and I've now made the rear axle articulate , I still got loads of work to do on this but I think I going in the right direction with it . I'm just making spreader plates which will be facing each other on the pivot point which will have grease between the. Similar to fith wheel coupling on a lorry to help it articulate and spread the load . Here is what I've done so far !