Yes, at the end of a walk 13 month old Henry will not get into the car.

He travels on the back seat of the car in a crate.
I have tried treats strewn on the back seat and in the crate, tickling his ears, ignoring him, looking the other way, putting the treats away, using the command 'basket'. The only thing I can't do is lift him, dodgy back. Yesterday a friend helped lift him in after 20 mins in the freezing rain!

He knows the command 'basket' in the house and will run at top speed into his crate in the house, waiting for his treat.

I'm guessing he doesn't want the walk to end, its usually after a one hour off lead run around, he gets four walks per day, 2-3 hrs. (spoilt!) On the way out for a walk a couple of treats gets him in.
Any tips will be appreciated.
Could it be the crate when wet? I could try a ramp and guard for the boot, or seat belts.
I think I might practice on the drive this weekend. Maybe treat after he has got in?
He is much better with my OH, but then he can lift Henry if there's any problems.
thanks for any tips!