I've done a fair amount of scheming about such a critter and even bought a bike to convert. A lot depends on the terrain you intend to tackle (I was always thinking of the deer I've carried back up steep bull-dozer tracks) as the Ebike people (sellers and users) make lots of promises that don't seem to be borne out by actual performance. In my case I haven't seen a set-up that I think will be able to walk a deer (let alone a deer and rider) up a several hundred feet of climb.
I tested a Bafang BBSHD and the guy I borrowed it from (who is a bloody keen hunter himeself) didn't think it would perform very well except up gradients you find in riverbeds. I had it too hot within 10 minutes and had to admit defeat.
Since then a few new units have appeared, the Bafang Ultra and CYC but I remain skeptical and am in the process of buying a Vitara/Escudo as I think my $3K will be better spent!
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