Welcome Mr & Mrs Charlie! LOTS of good choices out there both new and used. What vehicle(s) do you currently own? What Tow Rating does it have (hint: 3500# would be the minimum I'd recommend; 5000# would be even better). If your vehicle(s) is NOT rated to tow, get a vehicle that IS rated to tow (and allow for AT LEAST an extra 10%~15% margin of safety). If you need to buy a vehicle to tow with, BUY THE TRAILER FIRST!!! That way, you'll know EXACTLY how much tow capacity you actually need (Olivers and Airstreams are much heavier than Casitas and Scamps.
Bigfoot and
Escape are somewhere in the middle). If you're new to RVing, find and attend an RV Boot Camp. In as little as a weekend, you'll have all the systems found on a modern RV explained & demystified. Mistakes made with RVs are often expensive and, sometimes dangerous. RVBC graduates are smarter RV buyers and, safer RVers in general. The Escapees RV Club, FMCA, RVSEF and RV~Dreams offer this important training (the last two run ~ seven days; more social events). Eileen Glick of
Love My Casita has an EXCELLENT book "CASITA TRAVEL TRAILER A-Z OWNER'S GUIDE". Much of Eileen's book will apply to other btands of fiberglass "eggs". The Covid19 Pandemic has made things more difficult than usual. Once you've got the information you need, be ready to act quickly, especially on used "eggs" as they tend to sell quickly. Again, WELCOME!