Weight can be an issue with trollies.
However my trolley system came with a 17ah "car starter" type battery, but it runs out of oomph after 2/3 hours with my 60psi pump - let alone the more commonplace 100psi for van mounts.
So I use an 85 a/h from Bristol batteries - which costs about £35 plus vat.
I reckon 60/75 amp is about the right balance for a trolley and 85/110 for a van.
Leisure is better than car too.