Re: Hello all!
Consider all the advice given by all who've given answers here. You said you've been on 20 mile trips so make your next trip 50 miles, then 100 miles, then 200 miles and finally 300 miles. Is your goal a 300 mile round trip or 300 mile destination? This will determine what plans you need to make. Either way consider what you've learned from the shorter trip as how to prepare for your next longer trip.
Land Rider Jerry