packnrat wrote:
how long is your rv?
how long is your "factory" cord.
subtract the cord length from the rv length.
add in a couple feet round up and thats how long it needs to be at max length.
just think, if the power is farthest away from your power input spot.
This. Our toy hauler is 43' feet now and the stock cord is about 35'. The inlet is about middle of the camper. I've needed a 15' extension on quite a few occasion in the last 15 months.
On my last fifth wheel, it was 42' and the stock cord was about 35'. The power inlet was in the rear corner of the rig. I only needed an extension once but had to be particular about where I parked less than 5 times ... in almost 6 years of ownership!
For the OP- throw the extension cord in the truck bed. Doesn't take up premium storage space in the fifth wheel and is there when you need it.