It's not so much a size of coach thing, as it is the brand of Motorhome. I have a new 35' coach that came with a modern fully hydraulic system.
Electric Systems:
- Generally have an electrical limit switch. You don't want the switch to get fouled with water/mud/gravel/sand/dirt, or it won't work.
- Independent, if one goes, the rest of the system isn't compromised.
- Chrome or painted - It may rust and requires maintenance.
Hydraulic Systems:
- Older systems have big springs to retract the pistons. You don't want gravel/sand/dirt/mud in the springs.
- Newer systems have no springs. Must become familiar with manual retract process if things stop working.
- If one leveler goes bad, (like a bad leak), the entire system may not work, (only some systems).
- Stainless Steel - carefree.