My 50A power cord is 40' long and is usually adequate length for where ever I stay. When we 1st started full timing (about 7 yrs ago), we ended up in a place where we couldn't get close enough to reach the power post. It was hot as hell and I refused to be without air conditioning so I went out and bought a 35' 50A extension cord. It was too expensive and I was unhappy about it but I wasn't willing to compromise my comfort. Since then, I've used it less than 1/2 dozen times and loaned it out once. So, $/use is high but I have no regrets. It performs well, I never notice any voltage drop and I have electricity when I want it. YMMV