Nothing like the F620, though.
The Rancher XL is my nemesis. The s**t won't spawn and I've been searching for a week.
Intruder, Primo, Hardtop Manana, Phoenix, these are all child's play compared to the Rancher's spawn chance *sigh*
Intruders are damn rare even when driving mine, only seeing three batches of them spawn since i've owned mine- which is along time. Once you own an F620, then you just need to look abit and they'll spawn up and down Los Santos. Pheonix aren't rare, can't stress this enough. Just uncommon. Go chill near Simeon's docks for awhile. Primos are common once you drive a Futo enough. Rancher XLs spawn when your really not looking for them, near the airport junctions.
Theres my two pence, and I go looking for rare cars with rare cars daily in my drive, even if i'm not going to keep em.
Can't stress enough what my mate said after tireless searching on my half. Nothing is rare until you search for it.
If anyone needs help with cars like these, PM me. Glad to help, love looking for rare stuff.