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Towing a van involves putting you foot down alot more than normal.
So if the new parts especially the rings and bearing have not had a chance to bed in, then I would err on the side caution.
Engine will suffer blow by no doubt
Another way of looking at it.
Hang around for a week longer do some k's to run in.
This way if something should go wrong you are still near the work shop that did the work.
I would also hazard a guess, any warranty may to would be null and void if not run in at least before towing.
Good idea to have a follow up check before you head off to insure every thing is as it should be before you leave.
No leaks any where , bolts missing, loose bolts etc.
Also the Missus is not going to be happy if it goes pear shaped 500k from nearest town.
Cheers