Isn't the RZR4 under 9 feet long? I would check out the Work and Play 27ULSBS OR with your truck I would even go for the 30WRS Or my personal favaorite without the slide the 30WR...
The garage length in my 30WR is 10'6".
Scroll down through the models and check out the 20ULSBS and the 30WRS
http://www.rvtrader.com/New-and-Used-Forest-River-Work-And-Play-RVs-for-Sale----RVTrader.com/search-...
2017 Coleman 300tq by Dutchman Toy Hauler. 34.5 feet long and under 10k Gross. 500 watt Solar 2000 watt Inverter, 1999 Ford F250 2WD 7.3 4R100 DP Tuner, S&B Cold Air Intake, Gauges, 6.0 Trans Cooler, Air Bags.