question

You can transfer the items from a queue directly to another object (e.g. a trailer), that fitts under the queue. Then you store the projected location of every item in the queue in relation to the trailer in an array. After that you move the items to the trailer and update their locations in the trailer from the stored location array.

load-trailer-like-truck.fsm

load-trailer-like-truck-v170.fsm

/**Custom Code - PF activity*/
Object current = param(1);
treenode activity = param(2);
Token token = param(3);
treenode processFlow = ownerobject(activity);
Object queue = model().find("Queue1");
Object trailer = token.trailer;
Array item =  queue.subnodes.toArray();
Array itemloc = Array(item.length);
int idx = 1;
for (idx = 1; idx <= item.length; idx++)
{   Vec3 transform = item[idx].as(Object).location.project(queue,trailer);   
    itemloc[idx] = transform;}
for (idx = 1; idx <= item.length; idx++)
{   moveobject(item[idx],trailer,1);  
    item[idx].location = itemloc[idx];}

following the code for 17.0.12

/**Custom Code - V170*/
Object current = param(1);
treenode activity = param(2);
Token token = param(3);
treenode processFlow = ownerobject(activity);
Object queue = model().find("Queue1");
Object trailer = token.trailer;
int loadItemNo = queue.subnodes.length;
Array item = Array(loadItemNo); 
Array itemloc = Array(loadItemNo);
int idx = 1;
for (idx = 1; idx <= loadItemNo; idx++)
{   item[idx] = queue.subnodes[idx].as(treenode);
    Vec3 transform = item[idx].as(Object).location.project(queue,trailer);
    itemloc[idx] = transform;}
for (idx = 1; idx <= loadItemNo; idx++)
{   moveobject(item[idx],trailer,1);
    item[idx].location = itemloc[idx];}