About the only RV Park in Loveland is the Loveland RV Park. We stayed there last year. It met our needs with lots of trees and shade but some of the sites are pretty tight; our neighbors could watch our TV when our blinds were open. But we were only there to sleep so the blinds remained closed! The staff were all helpful and friendly. We did make reservations but not sure we needed them. This year we are staying in St.Vrain State Park which is right off I-25 in Longmont. It's about 25 min drive from there to Loveland.
Forgot to add: St Vrain is large park and does have FHU if needed.