In pouring over the specs of OA 40 through 48 the engines include: CAT 3116 NA & TA 3126TA 3208 NA & TA Cummins 6BTA DD 8.2 Perkins I would like feedback on just how cramped your ER is and the ease of access to the engines in a twin setup through the various models. By access, I mean difficulty to get at and perform all the routine maintenance required over time. Batteries, exchangers, transmissions, injectors, pumps, hoses, oil and filter changes, shafts and bearings etc. etc. etc.... In terms of an inflexible, old guy, are there things you just find easier to farm out? Thanks.