Not talking about towing

Talking about a bedspace only, 1-2 man crew setup

A Bobcat ZS4000 Stand-On Mower 48″ is a 64" long mower for example, so it should juuuust fit in there, but to be safe I mentioned smaller, though personally if I were to do something like this I'd want a greenworks electric, costs half as much as the truck

For sure, you'd see a range drop, but it shouldn't be anywhere near as severe as pulling a trailer

A small standon, a ramp to get it on and off the truck, a rack with a trimmer, edger, hedger, blower, pruner, mini chainsaw, maybe a delta powerbank or gas generator to recharge the tools as you drive about or they're in standby

I'd expect a drop in range about 25-30% with that but not as severe as a pull behind trailer

~130-150 miles of range is doable if you plan the route and cluster clients, which any Semi-competent business owner who could afford a fleet of these would be capable of doing or paying someone to manage the routes