I have an older version of this: https://www.summitracing.com/parts/cbc-sc1445?rrec=true . I just roll it to where I need.
And I have a bunch of trickle charger/maintainers. Battery Tender, NOCO. Viking (HF), Battery Minder, and some I got with a coupon at Costco. They all work well. The NOCO...